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It features a strong polyester film laminated and encapsulating a heavy, corrosion-resistant steel wire helix, forming the inner core. Designed for low to medium pressure systems and ideal for residential air distribution and venting applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFast, Economical Installation.\u003c\/li\u003e\n  \u003cli\u003eOversized Cores For Proper Fit.\u003c\/li\u003e\n  \u003cli\u003eEasily Shaped To Fit Oval Inlets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\n\u003cp\u003eUL181 Listed and Complies with NFPA Standards 90A and 90B. Complies with Most State and Federal Standards or Codes. 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Suitable for supply and return sections, it resolves misalignment issues and allows system extensions. The unit features a smooth liner, thermal insulation, a vapor barrier, and a double air seal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuitable for a variety of applications in low- to medium-pressure cooling and heating HVAC systems\u003c\/li\u003e\n  \u003cli\u003eInner core is made with strong polyester film encapsulating a corrosion-resistant steel wire helix\u003c\/li\u003e\n  \u003cli\u003eEfficient R-8 insulation prevents heat from entering or escaping your ducts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\n\u003cp\u003eThis flexible duct is quick to install and cost-effective, boasting R-8 thermal application value and an operating temperature range of -20 to 250 degrees Fahrenheit. 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It provides an economical means for handling misalignment between systems components and ducting around obstacles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThermally insulated and fully lined.\u003c\/li\u003e\n  \u003cli\u003eSuitable for new jobs or retrofit work.\u003c\/li\u003e\n  \u003cli\u003eDesigned for low to medium pressure systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\n\u003cp\u003eThis flexible air duct is ideal for system extensions or for changing conditioned zones. 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It can be used in either supply or return sections. Compliance to NFPA Standards allows you to install lengths longer than the 14' limitation applying to connectors.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThermally insulated\u003c\/li\u003e\n  \u003cli\u003eFully lined\u003c\/li\u003e\n  \u003cli\u003eUL 181 Class 1\u003c\/li\u003e\n  \u003cli\u003eDesigned for low to medium pressure cooling and heating HVAC systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\n\u003cp\u003eThis flexible air duct provides good airflow, thermal insulation and a double air seal. 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It can be used in both supply and return sections. The inner core is made with strong polyester film encapsulating a corrosion-resistant steel wire helix. It is fully lined with EcoTouch formaldehyde-free fiberglass insulation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuitable for a variety of applications in low- to medium-pressure cooling and heating HVAC systems\u003c\/li\u003e\n  \u003cli\u003eInner core is made with strong polyester film encapsulating a corrosion-resistant steel wire helix\u003c\/li\u003e\n  \u003cli\u003eFully lined with a thick blanket of EcoTouch formaldehyde-free fiberglass insulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\n\u003cp\u003eThis flexible duct resolves misalignment issues, makes system extensions, and changes conditioned zones. 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It can be used in both supply and return sections. The efficient unit is composed of a smooth liner, thermal insulation, a tough outer vapor barrier, and a double air seal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuitable for a variety of applications in low- to medium-pressure cooling and heating HVAC systems\u003c\/li\u003e\n  \u003cli\u003eInner core is made with strong polyester film encapsulating a corrosion-resistant steel wire helix\u003c\/li\u003e\n  \u003cli\u003eFully lined with a thick blanket of EcoTouch formaldehyde-free fiberglass insulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\n\u003cp\u003eThis flexible duct resolves misalignment issues, makes system extensions, and changes conditioned zones. 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This insulated duct features an R6 R-Value, providing thermal resistance to maintain air temperature and reduce energy loss. It is supplied in a bag for convenient handling and installation, making it suitable for various ventilation applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e8-inch diameter and 25-foot length for versatile installation.\u003c\/li\u003e\n  \u003cli\u003eR6 R-Value insulation provides thermal efficiency and energy savings.\u003c\/li\u003e\n  \u003cli\u003eFlexible design allows for easy routing and installation in diverse spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\n\u003cp\u003eInsulated flexible air duct for thermal efficiency and easy installation in HVAC systems.\u003c\/p\u003e\n\u003ch3\u003eProduct Information\u003c\/h3\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 054208000002\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: Thermaflex\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 054208000002\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 8-Inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 Feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Flex-Vent Insulated Flexible Air Duct\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackaging\u003c\/strong\u003e: Bag\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51267923116338,"sku":"054208000002","price":80.22,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/308907938.jpg?v=1785262228"},{"product_id":"thermaflex-55808000001-insulated-flex-duct-8-in-25-ft-r6","title":"Thermaflex 55808000001 Insulated Flex Duct 8 in 25 Ft R6","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe THERMAFLEX 55808000001 is an insulated flexible duct rated at R6 insulation value with an 8-inch inside diameter and a 25-foot length. Constructed from fiberglass and chlorinated polyethylene, it handles a temperature range of -20 to 250 degrees F and carries a vapor transmission rating of 0.05 perms — keeping moisture intrusion low in conditioned air applications. The silver outer jacket is a standard indicator of a vapor-barrier-wrapped flex duct. This product is installed by licensed HVAC technicians as a distribution component connecting supply plenums or branch takeoffs to diffusers and registers in residential and light commercial forced-air systems.\u003c\/p\u003e\n\u003cp\u003eThis insulated flexible duct is suited for pressure heating and cooling systems where both positive and negative static pressures are present. The 8-inch diameter is commonly used on trunk-to-register branch runs in mid-to-large residential systems or light commercial applications requiring higher airflow capacity. The 25-foot coil length provides enough material for a single long branch run or multiple shorter runs without splicing. The R6 insulation rating meets or exceeds common energy code minimums for duct insulation in unconditioned spaces such as attics and crawlspaces.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eR6 insulation value meets energy code requirements for ducts in unconditioned spaces\u003c\/li\u003e\n  \u003cli\u003e8-inch inside diameter supports higher-volume branch runs in residential and light commercial systems\u003c\/li\u003e\n  \u003cli\u003e25-foot length reduces the need for field splicing on longer runs\u003c\/li\u003e\n  \u003cli\u003eRated from -20 to 250 degrees F for compatibility with both heating and cooling airstreams\u003c\/li\u003e\n  \u003cli\u003e0.05 perms vapor transmission rating limits moisture infiltration through the duct wall\u003c\/li\u003e\n  \u003cli\u003ePositive 10 in-WG and negative 1 in-WG pressure ratings support standard forced-air system operating pressures\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with pressure heating and cooling systems. Suitable as an insulated branch duct in forced-air HVAC distribution systems where R6-rated flexible duct is specified.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by licensed HVAC technicians. Power down the air handling unit and confirm the system is depressurized before cutting into existing ductwork. Secure both ends of the flex duct with approved sheet metal screws and listed duct tape or mastic sealant per the International Mechanical Code and applicable local codes — do not rely on friction fit alone. 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Constructed with an R-8 insulation rating, this 14-inch diameter duct ships in a 25-foot length and features a silver outer jacket. It is used to connect air handling equipment to diffusers, registers, and grilles in supply-air applications. HVAC installers and sheet metal contractors work with this product during new construction and retrofit projects where flexible duct runs are required to navigate framing, joists, and tight plenum spaces.\u003c\/p\u003e\u003cp\u003eThis flexible duct is suited for supply-air runs in forced-air heating and cooling systems. The 14-inch diameter accommodates high-volume trunk-to-branch connections in larger residential systems and light commercial applications. The R-8 insulation value meets or exceeds energy code requirements in many jurisdictions, making it appropriate for unconditioned attic, crawlspace, and mechanical room installations where thermal loss is a primary concern.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eR-8 insulation rating reduces thermal loss in unconditioned spaces\u003c\/li\u003e\n\u003cli\u003e14-inch inner diameter supports high-volume airflow distribution\u003c\/li\u003e\n\u003cli\u003e25-foot length per bag allows for longer uninterrupted duct runs\u003c\/li\u003e\n\u003cli\u003eSilver outer jacket provides a durable, reflective vapor barrier\u003c\/li\u003e\n\u003cli\u003eFlexible construction allows routing around structural obstructions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC supply systems requiring a 14-inch diameter insulated duct with R-8 insulation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician or qualified sheet metal contractor in accordance with SMACNA flexible duct installation standards and local mechanical codes. Power down the air handling unit and confirm the system is de-energized before connecting or disconnecting duct sections. Avoid sharp bends, kinks, or compression of the duct core, as these conditions significantly increase static pressure and reduce airflow. Secure all connections with approved duct straps and UL-listed mastic or metal-backed tape.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter\u003c\/strong\u003e: 14 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation R-Value\u003c\/strong\u003e: R-8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Silver\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 56314000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51268899406130,"sku":"056314000002","price":155.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/308909509.png?v=1780709107"},{"product_id":"thermaflex-55806000001-flexible-air-duct-6in-x-25ft-r-6","title":"Thermaflex 55806000001 Flexible Air Duct 6in X 25ft R-6","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe THERMAFLEX 55806000001 is a Class I, R-6 insulated acoustical flexible air duct rated for medium-pressure heating and cooling HVAC systems. Constructed with a fiberglass insulation wrap over a steel wire inner core, this duct measures 6 inches in inner diameter and comes in a 25-foot length. It handles a temperature range of -20 to 250 degrees F, making it suitable for year-round supply and return applications. Licensed HVAC technicians install this duct in both new construction and retrofit projects where rigid fabricated ductwork is impractical or cost-prohibitive.\u003c\/p\u003e\u003cp\u003eThis flexible duct is suited for residential and light commercial air distribution systems. It works in supply or return sections including branch ducts, duct connections, and transitions between mixing units, diffusion devices, induction units, and control or terminal units. It is particularly useful for routing around structural obstacles or correcting misalignment between system components. It is also a practical choice for system extensions and reconfiguring conditioned zones in retrofit applications.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eClass I rated flexible duct suitable for medium-pressure HVAC systems\u003c\/li\u003e\n\u003cli\u003eR-6 insulation value reduces thermal loss in supply and return runs\u003c\/li\u003e\n\u003cli\u003e6-inch inner diameter by 25-foot length supports common branch duct sizing\u003c\/li\u003e\n\u003cli\u003eFiberglass and steel wire construction provides corrosion resistance and shape retention\u003c\/li\u003e\n\u003cli\u003eTemperature rated from -20 to 250 degrees F for heating and cooling use\u003c\/li\u003e\n\u003cli\u003eMade in America\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style flexible duct replacement or new-installation component for medium-pressure residential and light commercial HVAC air distribution systems requiring a 6-inch diameter insulated flexible duct.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician in accordance with SMACNA guidelines and applicable local mechanical codes. Disconnect and lock out power to the air handling unit before beginning duct work. Avoid sharp bends that reduce the inner diameter and restrict airflow; maintain the manufacturer-recommended bend radius throughout the run. Secure all connections with approved clamps and mastic or metal tape rated for flexible duct applications.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter\u003c\/strong\u003e: 6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Rating\u003c\/strong\u003e: R-6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass\u003c\/strong\u003e: Class I\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range\u003c\/strong\u003e: -20 to 250 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Fiberglass, Steel Wire\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Silver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle\u003c\/strong\u003e: Insulated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 10.7 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e: USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 55806000001\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51268901372210,"sku":"055806000001","price":178.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/308910611.jpg?v=1780709175"},{"product_id":"thermaflex-52304000001-insulated-flex-duct-4in-x-25ft-r8","title":"Thermaflex 52304000001 Insulated Flex Duct 4in X 25ft R8","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe THERMAFLEX 52304000001 is an insulated flexible duct section rated at R8, designed for low-velocity air distribution in residential and light commercial HVAC systems. Measuring 4 inches in diameter and 25 feet in length, this flex duct features a black poly outer jacket that resists moisture and UV degradation in attic and crawlspace environments. The R8 insulation value meets current energy code requirements in many jurisdictions, reducing heat gain and loss between the air handler and the supply register. It ships boxed as a single unit and is part of the Thermaflex KP series. HVAC installers and sheet metal mechanics are the primary end users for this product.\u003c\/p\u003e\u003cp\u003eThis flex duct is suited for branch-run supply applications in forced-air ducted systems, including gas furnace, heat pump, and air conditioning installations. It is commonly installed in residential attics, dropped ceilings, and crawlspaces where a flexible transition between rigid ductwork and a ceiling or wall register is required. The 25-foot length provides enough run for most residential branch applications without requiring a mid-run connector. Installers should avoid excessive bends and keep the duct fully extended to minimize airflow restriction.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eR8 insulation rating meets current energy code minimums for many climate zones\u003c\/li\u003e\n\u003cli\u003e4-inch diameter by 25-foot length suits standard residential branch duct runs\u003c\/li\u003e\n\u003cli\u003eBlack poly outer jacket provides moisture and mechanical protection in attic and crawlspace environments\u003c\/li\u003e\n\u003cli\u003eKP series construction engineered for low-velocity supply air distribution\u003c\/li\u003e\n\u003cli\u003eBoxed single-unit packaging protects the duct during jobsite storage and transport\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and new-installation flex duct for standard 4-inch collar fittings used in residential and light commercial forced-air HVAC systems.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by licensed HVAC technicians or sheet metal mechanics. Power down and lock out the air handling unit before connecting or disconnecting duct sections. Secure both ends with approved draw bands and UL 181B-listed tape or mastic per local mechanical code requirements. Avoid sharp bends and compression of the insulated jacket, as doing so reduces effective R-value and increases static pressure drop across the run.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Flex Duct\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubtype\u003c\/strong\u003e: Insulated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Rating\u003c\/strong\u003e: R8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Black Poly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: KP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Size\u003c\/strong\u003e: 1 each\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 52304000001\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619307389234,"sku":"052304000001","price":69.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/732edbbb3b979536737b912392c2eb62.jpg?v=1787327541"},{"product_id":"thermaflex-52308000002-insulated-flex-duct-8-in-x-25-ft-r-8","title":"Thermaflex 52308000002 Insulated Flex Duct 8 in X 25 Ft R-8","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe THERMAFLEX 52308000002 is an R-8 insulated flexible air duct designed for low to medium pressure HVAC distribution systems. The inner core is constructed from a polyester film laminated and encapsulating a heavy-gauge, corrosion-resistant steel wire helix, which maintains duct shape and resists collapse under system pressure. A thick blanket of fiberglass insulation surrounds the inner core over a fiberglass scrim, delivering R-8 thermal performance to reduce conductive heat loss through duct runs. The outer jacket is a durable black polyethylene vapor barrier that resists moisture infiltration. This duct is sized at 8 inches in diameter and ships in 25-foot lengths. Licensed HVAC technicians and sheet metal installers are the primary installers.\u003c\/p\u003e\u003cp\u003eThis flexible duct is suited for residential and light commercial forced-air systems where low to medium static pressure distribution is required. Typical applications include branch runs from a central plenum or trunk line to diffusers, registers, and grilles in attic, crawlspace, and conditioned-space installations. The R-8 insulation value meets or exceeds energy code requirements in most climate zones for unconditioned space duct runs, making it a common choice for attic installations in warm and mixed climates.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eR-8 fiberglass insulation blanket reduces conductive heat loss along duct runs\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant steel wire helix inner core maintains round cross-section and resists crush\u003c\/li\u003e\n\u003cli\u003ePolyester film inner liner laminated over the wire helix for smooth, durable airflow surface\u003c\/li\u003e\n\u003cli\u003eDurable black polyethylene outer jacket serves as an integral vapor barrier\u003c\/li\u003e\n\u003cli\u003eFiberglass scrim layer between insulation and outer jacket adds structural integrity\u003c\/li\u003e\n\u003cli\u003eRated for low to medium pressure systems, suitable for standard residential and light commercial air distribution\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC systems requiring an 8-inch diameter, R-8 insulated flex duct in low to medium pressure applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician in accordance with ACCA Manual D duct design guidelines and applicable local mechanical codes. Always shut down the air handling unit and de-energize the system before connecting or disconnecting duct sections. Secure both ends with approved draw bands and foil-backed mastic or listed duct tape rated for flexible duct; do not use standard cloth-backed tape. Avoid sharp bends, compression, or excessive sag, as these reduce airflow and effective R-value.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation R-Value\u003c\/strong\u003e: R-8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Core\u003c\/strong\u003e: Polyester film laminated over corrosion-resistant steel wire helix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Material\u003c\/strong\u003e: Fiberglass with fiberglass scrim\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Black polyethylene vapor barrier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: Low to medium pressure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 52308000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619425059122,"sku":"052308000002","price":128.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/11118821e918781295d9cda14d7153a7.webp?v=1787329566"},{"product_id":"thermaflex-53716000002-flex-duct-r-4-2-16in-x-25ft","title":"Thermaflex 53716000002 Flex Duct R-4.2 16in X 25ft","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe THERMAFLEX 53716000002 is a 16-inch diameter, 25-foot length insulated flexible air duct rated at R-4.2, designed for low- to medium-pressure HVAC distribution systems. The inner core is constructed from smooth, airtight polyester film laminated over a heavy-gauge, corrosion-resistant steel wire helix. This innercore structure maintains round cross-section under compression and resists kinking during routing. A thick fiberglass insulation blanket wraps the core, and a bi-directional reinforced metallized outer vapor barrier encapsulates the assembly. The outer jacket is engineered to resist unraveling at seams and cuts, making field handling more reliable for installation crews working in tight attic or crawlspace conditions.\u003c\/p\u003e\u003cp\u003eThis flexible duct is suited for residential and light commercial forced-air HVAC applications. It is commonly installed as branch runout duct connecting supply plenums or trunk lines to diffusers, registers, and grilles. The 16-inch diameter is typical for high-volume supply runs in larger residential systems or commercial rooftop unit distribution. Licensed HVAC technicians and sheet metal contractors are the primary installers. The R-4.2 insulation value meets minimum energy code requirements in many climate zones, making it a standard choice for unconditioned space duct runs such as attics and crawlspaces.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSmooth polyester inner core supports airflow efficiency in low- to medium-pressure systems\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant steel wire helix maintains duct shape and resists collapse\u003c\/li\u003e\n\u003cli\u003eR-4.2 fiberglass insulation blanket reduces thermal loss in unconditioned spaces\u003c\/li\u003e\n\u003cli\u003eBi-directional reinforced metallized outer vapor barrier resists moisture infiltration and will not unravel\u003c\/li\u003e\n\u003cli\u003eRated for airflow velocities up to 5000 FPM\u003c\/li\u003e\n\u003cli\u003eTemperature range of -20 degrees F to 250 degrees F supports heating and cooling applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style flexible duct for use in residential and light commercial forced-air HVAC distribution systems requiring a 16-inch inside diameter branch or trunk runout connection.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician or sheet metal contractor in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Power down the air handling unit and verify the system is de-energized before connecting or repositioning duct sections. Avoid sharp bends that reduce the duct's effective cross-section; maintain bend radii per manufacturer and code guidelines to preserve rated airflow performance. Seal all connections with UL 181B-rated mastic or approved metal tape — never use standard cloth duct tape.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R-4.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Velocity\u003c\/strong\u003e: 5000 FPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositive Pressure Rating\u003c\/strong\u003e: 10 inches WG (4-inch to 16-inch ID sizes)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNegative Pressure Rating\u003c\/strong\u003e: 0.5 inches WG (4-inch to 20-inch ID range)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range\u003c\/strong\u003e: -20 degrees F to 250 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Core Material\u003c\/strong\u003e: Polyester film over steel wire helix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Type\u003c\/strong\u003e: Fiberglass blanket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Bi-directional reinforced metallized vapor barrier\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 53716000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619482304818,"sku":"053716000002","price":59.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ba73609c661d3af6eda9ba9ebe4fabd3.webp?v=1787331142"},{"product_id":"thermaflex-53708000002-flex-duct-8-in-x-25-ft-r-4-2-km","title":"Thermaflex 53708000002 Flex Duct 8 in X 25 Ft R-4.2 Km","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe THERMAFLEX 53708000002 is an 8-inch diameter, 25-foot insulated flexible air duct rated R-4.2, designed for residential and light commercial HVAC distribution systems. The inner core consists of a smooth polyester film laminated over a heavy-gauge, corrosion-resistant steel wire helix, providing structural support while maintaining a low-friction airflow surface suited for low to medium static pressure applications. A thick fiberglass insulation blanket wraps the inner core, and a bi-directional reinforced metallized vapor barrier forms the outer jacket. Licensed HVAC technicians install this product as part of forced-air supply and return systems.\u003c\/p\u003e\n\u003cp\u003eThis flexible duct is used in trunk-and-branch and radial duct distribution layouts in residential and light commercial construction. Its 8-inch diameter suits high-volume branch runs off main supply plenums. The smooth inner core reduces pressure drop compared to corrugated alternatives, making it appropriate for low to medium pressure air handling systems. HVAC installers use it in attics, crawl spaces, and unconditioned cavities where vapor control and insulation performance are required by mechanical codes.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eR-4.2 fiberglass insulation blanket limits heat gain and loss in unconditioned spaces\u003c\/li\u003e\n  \u003cli\u003eSmooth polyester film inner core minimizes airflow resistance in low to medium pressure systems\u003c\/li\u003e\n  \u003cli\u003eHeavy-gauge corrosion-resistant steel wire helix maintains shape under installation stress and negative pressure\u003c\/li\u003e\n  \u003cli\u003eBi-directional reinforced metallized outer vapor barrier resists tearing and will not unravel at seams\u003c\/li\u003e\n  \u003cli\u003e8-inch diameter x 25-foot length provides a full working run per section\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement and standard installation flexible duct for residential and light commercial forced-air HVAC supply and return systems operating at low to medium static pressure.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eFlexible duct installation is performed by licensed HVAC technicians in accordance with ACCA Manual D and applicable local mechanical codes. Power down the air handling unit at the disconnect before making connections at the collar or plenum. Secure both ends with approved draw bands and listed duct mastic or UL-listed foil tape per SMACNA guidelines. Avoid sharp bends, compression, or kinking, which increase static pressure and reduce system efficiency.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation R-Value\u003c\/strong\u003e: R-4.2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Core Material\u003c\/strong\u003e: Smooth polyester film with corrosion-resistant steel wire helix\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation Material\u003c\/strong\u003e: Fiberglass blanket\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Bi-directional reinforced metallized vapor barrier\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: Low to medium pressure systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 53708000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619500720434,"sku":"053708000002","price":104.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ba73609c661d3af6eda9ba9ebe4fabd3_1105a3e3-0463-4c12-a3d5-0677ce1f8f41.webp?v=1787331485"},{"product_id":"thermaflex-53814000002-flex-vent-insulated-flex-duct-14in-x-25ft-r-6","title":"Thermaflex 53814000002 Flex-vent Insulated Flex Duct 14in X 25ft R-6","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe THERMAFLEX 53814000002 is a 14-inch diameter, 25-foot section of KM Flex-Vent insulated flexible air duct rated at R-6. The inner core is a smooth, airtight polyester film laminated over a heavy-gauge, corrosion-resistant steel wire helix. This construction supports a thick blanket of fiberglass insulation wrapped around the inner core, then enclosed by a bi-directional reinforced metallized outer vapor barrier that resists unraveling. The assembly is engineered for low- to medium-pressure HVAC distribution systems. Licensed HVAC technicians and sheet metal contractors install this product in residential and light commercial forced-air systems.\u003c\/p\u003e\n\u003cp\u003eThis flexible duct is suited for supply and return air distribution in residential and light commercial HVAC installations. The 14-inch inner diameter accommodates high-volume trunk runs and large branch connections off main plenums or wye fittings. It performs across a temperature range of -20 degrees F to 250 degrees F, making it appropriate for both heating and cooling applications. Maximum rated velocity is 5,000 FPM, supporting high-flow system designs without exceeding the structural limits of the inner core.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eR-6 fiberglass insulation blanket reduces heat gain and loss along duct runs\u003c\/li\u003e\n  \u003cli\u003eSmooth airtight polyester inner core minimizes airflow resistance in low- to medium-pressure systems\u003c\/li\u003e\n  \u003cli\u003eCorrosion-resistant steel wire helix innercore maintains shape and resists collapse under negative pressure\u003c\/li\u003e\n  \u003cli\u003eBi-directional reinforced metallized outer vapor barrier prevents moisture intrusion and does not unravel\u003c\/li\u003e\n  \u003cli\u003eRated to 5,000 FPM air velocity for high-volume distribution runs\u003c\/li\u003e\n  \u003cli\u003eWide temperature range of -20 degrees F to 250 degrees F supports heating and cooling duty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style flexible duct section for residential and light commercial forced-air HVAC distribution systems requiring a 14-inch inner diameter connection with R-6 insulation performance.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician or sheet metal contractor in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Power down and lock out the air handler or furnace before connecting or repositioning duct sections. Secure both ends with approved draw bands and mastic or UL 181B-listed tape — do not use standard cloth duct tape. Avoid sharp bends and excessive compression of the duct body, as either condition significantly reduces effective airflow and insulation performance.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Diameter\u003c\/strong\u003e: 14 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R-6.0\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePositive Pressure Rating\u003c\/strong\u003e: 10 inches WG (4-16 inch ID); 6 inches WG (18-20 inch ID)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNegative Pressure Rating\u003c\/strong\u003e: 0.5 inches WG (4-20 inch ID)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Air Velocity\u003c\/strong\u003e: 5,000 FPM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Range\u003c\/strong\u003e: -20 degrees F to 250 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Core Material\u003c\/strong\u003e: Polyester film with steel wire helix\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation Material\u003c\/strong\u003e: Fiberglass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Bi-directional reinforced metallized vapor barrier\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable Diameter Range\u003c\/strong\u003e: 4-20 inches ID\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable R-Values\u003c\/strong\u003e: R-4.2, R-6.0, R-8.0\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 53814000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619538829618,"sku":"053814000002","price":147.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ba73609c661d3af6eda9ba9ebe4fabd3_679e70fe-56b6-4ce3-bcf6-9cc1e1fa398d.webp?v=1787331562"},{"product_id":"thermaflex-56304000002-insulated-flex-duct-4-in-x-25-ft-r8","title":"Thermaflex 56304000002 Insulated Flex Duct 4 in X 25 Ft R8","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe THERMAFLEX 56304000002 is a 4-inch diameter, 25-foot insulated flexible air duct rated R8, engineered for low- to medium-pressure HVAC distribution systems. The inner core is a smooth, airtight polyester film construction that minimizes turbulence and restricts airflow losses. Encapsulating that inner liner is a heavy-gauge, corrosion-resistant steel wire helix that holds the duct shape under pressure and resists crushing. A thick blanket of fiberglass insulation wraps the core, delivering the R8 thermal performance required by many current energy codes. HVAC technicians and sheet metal contractors install this duct in residential and light commercial supply air applications.\u003c\/p\u003e\u003cp\u003eThis flexible duct is suited for residential forced-air systems and light commercial installations where a pre-insulated, code-compliant flex duct run is required. It works in attic spaces, crawlspaces, and framed chases, connecting trunk lines or plenums to diffusers and grilles. The 25-foot length accommodates most branch-run requirements without splicing. Its bi-directional reinforced metallized outer vapor barrier resists moisture infiltration in humid environments such as unconditioned attics and vented crawlspaces, which is a common failure point with lower-grade flex products.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eR8 fiberglass insulation meets stringent residential and commercial energy code requirements\u003c\/li\u003e\n\u003cli\u003eSmooth polyester inner core reduces static pressure loss compared to corrugated or wire-exposed liners\u003c\/li\u003e\n\u003cli\u003eHeavy corrosion-resistant steel wire helix maintains round cross-section and resists kinking\u003c\/li\u003e\n\u003cli\u003eBi-directional reinforced metallized outer vapor barrier will not unravel or delaminate\u003c\/li\u003e\n\u003cli\u003e4-inch diameter by 25-foot length covers typical branch duct runs without mid-run splicing\u003c\/li\u003e\n\u003cli\u003eDesigned for low- to medium-pressure supply air systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC supply systems requiring a 4-inch diameter insulated duct with R8 thermal resistance.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician or qualified sheet metal contractor in accordance with ACCA Manual D, SMACNA guidelines, and applicable local mechanical codes. Power down the air handler and close the disconnect before connecting or cutting flex duct. Avoid sharp bends, kinks, or compression of the duct run, as these significantly increase static pressure and reduce system airflow. Secure both ends with approved clamps or draw bands and seal with UL 181B-listed mastic or foil tape rated for flex duct connections.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation R-Value\u003c\/strong\u003e: R8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Type\u003c\/strong\u003e: Fiberglass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Core Material\u003c\/strong\u003e: Polyester film\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Core Construction\u003c\/strong\u003e: Smooth, airtight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Material\u003c\/strong\u003e: Corrosion-resistant steel wire\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Vapor Barrier\u003c\/strong\u003e: Bi-directional reinforced metallized film\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: Low to medium pressure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 56304000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619617112370,"sku":"056304000002","price":72.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ba73609c661d3af6eda9ba9ebe4fabd3_d11c782e-f26c-412b-90af-d6ca15566830.webp?v=1787332502"},{"product_id":"thermaflex-53707000002-flex-duct-7-in-x-25-ft-r-4-2","title":"Thermaflex 53707000002 Flex Duct 7 in X 25 Ft R-4.2","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe THERMAFLEX 53707000002 is a 7-inch diameter, 25-foot length insulated flexible air duct from the KM Flex-Vent product line, rated at R-4.2. The inner core is constructed from a smooth, airtight polyester film laminated over a heavy-gauge, corrosion-resistant steel wire helix. This core supports a thick fiberglass insulation blanket. The outer jacket is a bi-directional reinforced metallized vapor barrier designed to resist unraveling. Rated for velocities up to 5000 FPM and temperatures from -20 degrees F to 250 degrees F, this duct is suited for low- to medium-pressure supply and return air systems. HVAC installers and sheet metal contractors are the primary installers of this product.\u003c\/p\u003e\u003cp\u003eThis flexible duct is used in residential and light commercial HVAC applications where a field-routable, pre-insulated duct section is required. Typical installations include branch runs from a plenum or trunk line to diffusers and registers in forced-air heating and cooling systems. The 7-inch diameter accommodates moderate airflow branch runs. The duct is compatible with standard 7-inch sheet metal collars, spin-in fittings, and flexible duct connectors commonly used in ductwork systems.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eR-4.2 fiberglass insulation blanket reduces thermal loss across branch duct runs\u003c\/li\u003e\n\u003cli\u003eSmooth polyester inner core minimizes airflow resistance and supports low- to medium-pressure operation\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant steel wire helix innercore maintains shape and resists kinking\u003c\/li\u003e\n\u003cli\u003eBi-directional reinforced metallized outer vapor barrier resists unraveling and moisture infiltration\u003c\/li\u003e\n\u003cli\u003eWide temperature rating of -20 degrees F to 250 degrees F suits both heating and cooling applications\u003c\/li\u003e\n\u003cli\u003eMaximum air velocity rating of 5000 FPM supports standard forced-air system design\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard flexible air duct replacement or new-installation component for residential and light commercial forced-air HVAC systems using 7-inch duct connections.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified HVAC technician or licensed contractor in accordance with SMACNA flexible duct installation standards and local mechanical codes. Power down and lock out the air handling unit before connecting or sealing duct sections. Secure each end with an approved draw band or clamp and seal with UL 181B-listed mastic or tape. Avoid sharp bends and excessive compression of the duct, as both increase static pressure and reduce system efficiency.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 7 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R-4.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter Range (Product Line)\u003c\/strong\u003e: 4 to 20 inches ID\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositive Pressure Rating\u003c\/strong\u003e: 10 inches wg (4 to 16 inches ID); 6 inches wg (18 to 20 inches ID)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNegative Pressure Rating\u003c\/strong\u003e: 0.5 inches wg (4 to 20 inches ID)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Air Velocity\u003c\/strong\u003e: 5000 FPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range\u003c\/strong\u003e: -20 degrees F to 250 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Core Material\u003c\/strong\u003e: Polyester film over steel wire helix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Material\u003c\/strong\u003e: Fiberglass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Bi-directional reinforced metallized vapor barrier\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 53707000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619625009458,"sku":"053707000002","price":67.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ba73609c661d3af6eda9ba9ebe4fabd3_7e2970d4-06b4-47b0-be32-74dd2ff95138.webp?v=1787332640"},{"product_id":"thermaflex-52305000002-flex-vent-r-8-insulated-flex-duct-5in-x-25ft","title":"Thermaflex 52305000002 Flex-vent R-8 Insulated Flex Duct 5in X 25ft","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe THERMAFLEX 52305000002 is a 5-inch diameter, 25-foot length R-8 insulated flexible air duct engineered for low to medium pressure HVAC distribution systems. The inner core combines a polyester film laminate with an encapsulated heavy-gauge, corrosion-resistant steel wire helix, providing structural support and flexibility under system pressure. A thick fiberglass insulation blanket over a fiberglass scrim delivers the R-8 thermal performance. The outer vapor barrier consists of a durable black polyethylene jacket rated for continuous operation from -20 degrees F to 250 degrees F. Licensed HVAC technicians install this duct in residential and light commercial air distribution applications.\u003c\/p\u003e\n\u003cp\u003eThis flexible duct is suited for trunk-to-register runs, branch takeoffs, and return-air connections in ducted forced-air systems. Its construction handles positive static pressure up to 10 inches WG for diameters through 16 inches ID and air velocities up to 5000 FPM. The duct is appropriate for attic, crawlspace, and interior mechanical room installations where insulated flex is the specified distribution method. The 25-foot coil length reduces the number of joints required on longer runs, limiting leakage points in the distribution system.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eR-8 fiberglass insulation blanket over fiberglass scrim for high thermal efficiency\u003c\/li\u003e\n  \u003cli\u003eCorrosion-resistant steel wire helix inner core encapsulated in polyester film laminate\u003c\/li\u003e\n  \u003cli\u003eDurable black polyethylene outer vapor barrier jacket\u003c\/li\u003e\n  \u003cli\u003eRated for positive static pressure up to 10 inches WG (4-inch through 16-inch ID)\u003c\/li\u003e\n  \u003cli\u003eMaximum air velocity rating of 5000 FPM\u003c\/li\u003e\n  \u003cli\u003eOperating temperature range of -20 degrees F to 250 degrees F\u003c\/li\u003e\n  \u003cli\u003e5-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style flexible duct for low to medium pressure residential and light commercial forced-air HVAC distribution systems with a 5-inch round collar or takeoff fitting.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by licensed HVAC technicians in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Power down and lock out the air handling unit before making connections at the collar or plenum takeoff. Secure each end of the duct with an approved clamp or drawband, then seal with UL 181B-listed mastic or tape — do not rely on duct tape alone. Avoid sharp bends or compression that reduce the duct cross-section, as both significantly increase static pressure drop and reduce system airflow.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 5 inches ID\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R-8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePositive Pressure Rating\u003c\/strong\u003e: 10 inches WG (4-inch through 16-inch ID)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNegative Pressure Rating\u003c\/strong\u003e: 0.5 inches WG (4-inch through 20-inch ID)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Air Velocity\u003c\/strong\u003e: 5000 FPM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Range\u003c\/strong\u003e: -20 degrees F to 250 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Core\u003c\/strong\u003e: Polyester film laminate with corrosion-resistant steel wire helix\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation\u003c\/strong\u003e: Fiberglass blanket over fiberglass scrim\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Black polyethylene vapor barrier\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e: 5 years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 52305000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619638640946,"sku":"052305000002","price":71.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/11118821e918781295d9cda14d7153a7_240681d2-833a-4091-ad2d-85efbc93c776.webp?v=1787332927"},{"product_id":"thermaflex-56312000002-flex-vent-r-8-insulated-flex-duct-12in-x-25ft","title":"Thermaflex 56312000002 Flex-vent R-8 Insulated Flex Duct 12in X 25ft","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe THERMAFLEX 56312000002 is a KM-series R-8 insulated flexible air duct designed for low- to medium-pressure HVAC distribution systems. It measures 12 inches in diameter and comes in a 25-foot length. The inner core is a smooth polyester film supported by a heavy-gauge, corrosion-resistant steel wire helix. That helix maintains the circular cross-section under compression and bending. A thick blanket of fiberglass insulation wraps the core to deliver an R-8 thermal rating. A bi-directional reinforced metallized vapor barrier forms the outer jacket, resisting moisture infiltration without unraveling at seams or cut ends. HVAC technicians and sheet metal installers use this duct in residential and light commercial air distribution branches.\u003c\/p\u003e\n\u003cp\u003eThis flexible duct is suited for residential forced-air systems and light commercial HVAC installations where flexible branch runs connect rigid trunk lines or air handlers to supply registers. The 12-inch diameter accommodates higher-volume branch runs typical of large residential zones or small commercial spaces. The R-8 insulation rating meets requirements commonly specified for attic, crawlspace, and unconditioned-space installations under energy codes. The reinforced outer vapor barrier makes it appropriate for humid or semi-conditioned environments where moisture control is critical.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eR-8 fiberglass insulation blanket reduces heat gain and loss in unconditioned spaces\u003c\/li\u003e\n  \u003cli\u003eSmooth polyester film inner core promotes low air resistance and easy airflow in low- to medium-pressure systems\u003c\/li\u003e\n  \u003cli\u003eHeavy-gauge corrosion-resistant steel wire helix supports the inner core and maintains duct shape under bending\u003c\/li\u003e\n  \u003cli\u003eBi-directional reinforced metallized outer vapor barrier resists moisture and will not unravel at cut edges\u003c\/li\u003e\n  \u003cli\u003e12-inch diameter by 25-foot length suits high-volume residential branch runs and light commercial supply lines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC systems requiring a 12-inch insulated flex duct with an R-8 thermal rating.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician in accordance with applicable mechanical codes, including SMACNA flexible duct installation guidelines and local energy code requirements. Shut down and de-energize the air handling unit before connecting or securing duct ends. Secure each end with approved clamps or draw bands and seal with listed mastic or metal tape rated for flexible duct. Avoid sharp bends that compress the inner core, as restricted cross-sections increase static pressure and reduce system airflow.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 12 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation R-Value\u003c\/strong\u003e: R-8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation Type\u003c\/strong\u003e: Fiberglass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Core Material\u003c\/strong\u003e: Polyester film with steel wire helix\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Bi-directional reinforced metallized vapor barrier\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: Low to medium pressure systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 56312000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619728163122,"sku":"056312000002","price":147.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ba73609c661d3af6eda9ba9ebe4fabd3_37613107-1063-4dbd-8bfb-3c0cf7478399.webp?v=1787333830"},{"product_id":"thermaflex-54210000002-flex-duct-10-in-25-ft-r6","title":"Thermaflex 54210000002 Flex Duct 10 in 25 Ft R6","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe THERMAFLEX 54210000002 is an insulated flexible air duct from the Flex-Vent KP Series, engineered for residential and light commercial HVAC distribution systems. Constructed with a polyester and steel core, it delivers a thermal resistance rating of R6 and a velocity rating of 5,000 feet per minute, making it suitable for high-flow supply and return air applications. The duct measures 10 inches in diameter and 25 feet in length, providing a full run for trunk-to-diffuser connections without mid-run splices. Licensed HVAC technicians and sheet metal contractors are the primary installers of this product.\u003c\/p\u003e\n\u003cp\u003eThis flexible duct is used in ducted forced-air systems where rigid ductwork transitions to flexible runs serving ceiling, wall, or floor diffusers. Its operating temperature range of -20 to 250 degrees F accommodates both heating and cooling system airstreams. The low vapor transmission rating of 0.1 perm reduces the risk of condensation within the duct assembly, which is particularly relevant in high-humidity climates and unconditioned attic or crawl space installations. It is produced domestically.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eR6 insulation rating reduces heat gain and loss along the duct run\u003c\/li\u003e\n  \u003cli\u003e5,000 feet per minute velocity rating supports high-CFM supply applications\u003c\/li\u003e\n  \u003cli\u003e10-inch diameter by 25-foot length provides a full flexible run in a single piece\u003c\/li\u003e\n  \u003cli\u003ePositive pressure rating of 10 inches water gauge and negative rating of 0.5 inches water gauge\u003c\/li\u003e\n  \u003cli\u003e0.1 perm vapor transmission minimizes condensation risk in humid environments\u003c\/li\u003e\n  \u003cli\u003ePolyester and steel construction balances flexibility with structural integrity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation flexible duct for residential and light commercial forced-air HVAC distribution systems using 10-inch round duct connections.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician in accordance with SMACNA flexible duct installation standards and local mechanical codes. Always power down the air handling unit before connecting or disconnecting duct sections, and support the duct at intervals specified by the manufacturer to prevent sagging that reduces airflow. Secure all connections with approved clamps and mastic or listed duct tape rated for flexible duct. Avoid sharp bends or compressions that restrict airflow or degrade the insulation wrap.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 10 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVelocity Rating\u003c\/strong\u003e: 5,000 feet per minute\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePositive Pressure Rating\u003c\/strong\u003e: 10 inches water gauge\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNegative Pressure Rating\u003c\/strong\u003e: 0.5 inches water gauge\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature Range\u003c\/strong\u003e: -20 to 250 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVapor Transmission\u003c\/strong\u003e: 0.1 perm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Polyester and Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin\u003c\/strong\u003e: Domestic\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 54210000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619776233778,"sku":"054210000002","price":143.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/299ad48924e926edcc160e671f20d98c.jpg?v=1787334221"},{"product_id":"thermaflex-54209000001-insulated-flex-duct-9in-x-25ft-r-6","title":"Thermaflex 54209000001 Insulated Flex Duct 9in X 25ft R-6","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe THERMAFLEX 54209000001 is a 9-inch diameter, 25-foot insulated flexible air duct rated R-6, designed for low to medium pressure HVAC distribution systems. The inner core is constructed from a polyester film laminated over a heavy, corrosion-resistant steel wire helix, providing structural support and flexibility under pressure. A thick blanket of fiberglass insulation surrounds the inner liner and is reinforced with a fiberglass scrim. The outer vapor barrier consists of a durable black polyethylene jacket that protects the insulation from moisture and mechanical damage. Licensed HVAC technicians install this product in residential and light commercial duct systems.\u003c\/p\u003e\n\u003cp\u003eThis flexible duct is suited for supply and return air distribution runs in attics, crawlspaces, and mechanical rooms where routing around obstructions is required. Its low-to-medium pressure rating makes it appropriate for standard forced-air systems using conventional air handlers and furnaces. The 9-inch diameter accommodates higher-volume branch runs and trunk-to-branch transitions. The 25-foot length reduces the number of joints needed on longer runs, supporting cleaner, lower-resistance duct layouts.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eR-6 insulation value reduces heat gain and loss along distribution runs\u003c\/li\u003e\n  \u003cli\u003eCorrosion-resistant steel wire helix inner core maintains shape under operating pressure\u003c\/li\u003e\n  \u003cli\u003ePolyester film inner liner laminated to wire helix for durability and airflow integrity\u003c\/li\u003e\n  \u003cli\u003eFiberglass insulation blanket with fiberglass scrim reinforcement layer\u003c\/li\u003e\n  \u003cli\u003eDurable black polyethylene outer jacket serves as vapor barrier\u003c\/li\u003e\n  \u003cli\u003eRated for low to medium pressure HVAC applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC distribution systems operating at low to medium static pressure.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician in accordance with SMACNA guidelines and local mechanical codes. Disconnect and lock out power to the air handler or furnace before connecting or repositioning duct sections. Avoid sharp bends that reduce the interior diameter and increase static pressure drop. Secure all connections with approved clamps and mastic or UL-listed tape to maintain system integrity and prevent air leakage.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 9 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation Rating\u003c\/strong\u003e: R-6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Core\u003c\/strong\u003e: Polyester film laminated over corrosion-resistant steel wire helix\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation Material\u003c\/strong\u003e: Fiberglass with fiberglass scrim\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Black polyethylene vapor barrier\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: Low to medium pressure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 54209000001\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619786981682,"sku":"054209000001","price":34.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6c1cfb76befb9bb3b288cb59dec253e6.webp?v=1787334477"},{"product_id":"thermaflex-56305000002-flex-vent-r-8-insulated-flex-duct-5-in-x-25-ft","title":"Thermaflex 56305000002 Flex-vent R-8 Insulated Flex Duct 5 in X 25 Ft","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe THERMAFLEX 56305000002 is an R-8 insulated flexible air duct in the KM Flex-Vent series, designed for low- to medium-pressure HVAC air distribution systems. The inner core is a smooth, airtight polyester film that minimizes airflow resistance and supports clean, efficient distribution. Encapsulating the inner core is a heavy-gauge, corrosion-resistant steel wire helix that maintains round cross-section under compression and bending. A thick fiberglass insulation blanket surrounds the core, delivering an R-8 thermal value. The outer jacket is a bi-directional reinforced metallized vapor barrier that resists unraveling and protects insulation integrity. Licensed HVAC technicians and sheet metal installers use this duct in residential and light commercial supply-air applications.\u003c\/p\u003e\u003cp\u003eThis flexible duct is suited for supply-air branch runs in residential forced-air systems and light commercial HVAC installations. Its 5-inch inside diameter fits standard branch takeoffs and boot fittings common in residential trunk-and-branch and radial plenum layouts. The R-8 insulation value meets or exceeds energy code requirements in many climate zones, making it appropriate for attic, crawlspace, and unconditioned-space installations where thermal loss is a primary concern. The 25-foot length accommodates most single-branch runs without a splice.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eR-8 fiberglass insulation blanket for high thermal efficiency in unconditioned spaces\u003c\/li\u003e\n\u003cli\u003eSmooth polyester inner core engineered for low- to medium-pressure airflow systems\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant steel wire helix maintains duct shape and prevents collapse\u003c\/li\u003e\n\u003cli\u003eBi-directional reinforced metallized outer vapor barrier resists unraveling and moisture infiltration\u003c\/li\u003e\n\u003cli\u003eRated for velocities up to 5000 feet per minute\u003c\/li\u003e\n\u003cli\u003eOperating temperature range of -20 degrees F to 250 degrees F\u003c\/li\u003e\n\u003cli\u003e5-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC supply systems with 5-inch branch connections. Positive pressure rating is 10 inches water gauge for 4-inch through 16-inch inside diameter sizes; negative pressure rating is 1\/2 inch water gauge across the full 4-inch to 20-inch inside diameter range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician or qualified sheet metal installer in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Power down and lock out the air handler or furnace before connecting or replacing duct sections. Avoid sharp bends and compression that reduce the duct's effective cross-sectional area and increase static pressure drop. Secure both ends with approved duct clamps or ties and seal with UL 181B-listed mastic or tape before covering with insulation jackets at connections.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R-8.0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositive Pressure Rating\u003c\/strong\u003e: 10 inches water gauge (4-inch to 16-inch ID sizes)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNegative Pressure Rating\u003c\/strong\u003e: 0.5 inches water gauge (4-inch to 20-inch ID sizes)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Velocity\u003c\/strong\u003e: 5000 feet per minute\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range\u003c\/strong\u003e: -20 degrees F to 250 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Core Material\u003c\/strong\u003e: Polyester film\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Material\u003c\/strong\u003e: Corrosion-resistant steel wire\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Material\u003c\/strong\u003e: Fiberglass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Bi-directional reinforced metallized vapor barrier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e: 5 years\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 56305000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619816014130,"sku":"056305000002","price":79.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9d4bf1bfc17e66c4fc31f8686cda7357.jpg?v=1787334869"},{"product_id":"thermaflex-52310000002-flex-duct-10in-x-25ft-r-8","title":"Thermaflex 52310000002 Flex Duct 10in X 25ft R-8","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe THERMAFLEX 52310000002 is a 10-inch diameter, 25-foot length insulated flexible air duct rated at R-8, designed for low-to-medium pressure HVAC distribution systems. The inner core is constructed from a polyester film laminated around a heavy-gauge, corrosion-resistant steel wire helix, providing structural rigidity while maintaining flexibility during installation. A thick fiberglass insulation blanket over a fiberglass scrim delivers the R-8 thermal performance. The outer jacket is a durable black polyethylene vapor barrier that resists moisture intrusion. Licensed HVAC contractors and sheet metal mechanics install this product in both new construction and retrofit applications.\u003c\/p\u003e\n\u003cp\u003eThis flexible duct is suited for residential and light commercial forced-air systems where branch runs connect from a trunk line or plenum to supply registers and diffusers. The 10-inch diameter accommodates higher-volume branch runs. The product is rated for use in low-to-medium pressure systems and performs across a broad temperature range of -20 degrees F to 250 degrees F, making it appropriate for heating and cooling distribution alike. The 25-foot roll length reduces the number of joints required on longer runs.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eR-8 insulation value for high-performance thermal efficiency in conditioned-space and unconditioned-space installations\u003c\/li\u003e\n  \u003cli\u003eCorrosion-resistant steel wire helix inner core maintains duct shape under pressure and during flexing\u003c\/li\u003e\n  \u003cli\u003ePolyester film inner liner laminated over the wire helix for a smooth, durable airway surface\u003c\/li\u003e\n  \u003cli\u003eDurable black polyethylene outer jacket serves as an integrated vapor barrier\u003c\/li\u003e\n  \u003cli\u003eRated for velocities up to 5,000 FPM and positive static pressure up to 10 inches WG (4-inch to 16-inch ID)\u003c\/li\u003e\n  \u003cli\u003e5-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for low-to-medium pressure forced-air HVAC distribution systems. Suitable for supply-side branch duct runs in systems requiring R-8 insulated flexible duct with a 10-inch internal diameter.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician in accordance with SMACNA flexible duct installation standards and local mechanical codes. Power down the air handling unit and close the system before making duct connections. Avoid sharp bends or compressed sections that reduce airflow and thermal performance. Secure each end with an approved clamp or draw band and seal with UL 181B-listed mastic or tape rated for flexible duct applications.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 10 inches ID\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R-8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable Diameter Range\u003c\/strong\u003e: 4 to 20 inches ID\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePositive Pressure Rating\u003c\/strong\u003e: 10 inches WG (4-inch to 16-inch ID), 6 inches WG (18-inch to 20-inch ID)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNegative Pressure Rating\u003c\/strong\u003e: 0.5 inches WG (4-inch to 20-inch ID)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Velocity\u003c\/strong\u003e: 5,000 FPM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Range\u003c\/strong\u003e: -20 degrees F to 250 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Core\u003c\/strong\u003e: Polyester film laminated over corrosion-resistant steel wire helix\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation\u003c\/strong\u003e: Fiberglass blanket over fiberglass scrim\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Black polyethylene vapor barrier\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure Classification\u003c\/strong\u003e: Low to medium pressure\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e: 5 years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 52310000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619823190322,"sku":"052310000002","price":106.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/11118821e918781295d9cda14d7153a7_322363dd-0399-418b-82cd-209104fb9aba.webp?v=1787335017"},{"product_id":"thermaflex-52306000002-flex-duct-6-in-x-25-ft-r-8","title":"Thermaflex 52306000002 Flex Duct 6 in X 25 Ft R-8","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe THERMAFLEX 52306000002 is a 6-inch diameter, 25-foot length insulated flexible air duct rated at R-8, engineered for low to medium pressure HVAC distribution systems. The inner core is constructed from a heavy-gauge, corrosion-resistant steel wire helix laminated with a strong polyester film, providing structural support and resistance to collapse under negative pressure. A thick fiberglass insulation blanket over a fiberglass scrim delivers the R-8 thermal performance. The outer vapor barrier is a durable black polyethylene jacket. This product is installed by licensed HVAC technicians in both new construction and retrofit applications.\u003c\/p\u003e\n\u003cp\u003eThis flexible duct is suited for residential and light commercial HVAC systems where low to medium static pressure distribution is required. It is used in supply and return air branch runs connecting main trunk lines to diffusers, grilles, and registers. The product handles air velocities up to 5000 FPM and operates across a temperature range of -20 degrees F to 250 degrees F, making it appropriate for heating, cooling, and ventilation applications in conditioned spaces and unconditioned attics or crawlspaces.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eR-8 fiberglass insulation blanket reduces thermal loss in unconditioned spaces\u003c\/li\u003e\n  \u003cli\u003eSteel wire helix inner core resists collapse and maintains airflow cross-section\u003c\/li\u003e\n  \u003cli\u003ePolyester film laminate on inner liner provides a smooth, durable air contact surface\u003c\/li\u003e\n  \u003cli\u003eBlack polyethylene outer jacket serves as a vapor barrier and protects insulation\u003c\/li\u003e\n  \u003cli\u003eRated for air velocities up to 5000 FPM for broad system compatibility\u003c\/li\u003e\n  \u003cli\u003ePositive pressure rating of 10 inches WG (4-inch to 16-inch ID) for confident low to medium pressure use\u003c\/li\u003e\n  \u003cli\u003e5-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style flexible duct replacement or new-installation component for residential and light commercial low to medium pressure forced-air HVAC systems. Available in diameter sizes from 4 inches to 20 inches ID across the product family.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Power down and lock out the air handling unit before connecting or disconnecting any ductwork. Avoid sharp bends, kinks, or compression of the duct, as these reduce airflow and effective R-value. Secure all connections with approved clamps and mastic or UL-listed tape per code requirements.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 6 inches ID\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R-8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePositive Pressure Rating\u003c\/strong\u003e: 10 inches WG (4-inch to 16-inch ID)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNegative Pressure Rating\u003c\/strong\u003e: 0.5 inches WG (4-inch to 20-inch ID)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Air Velocity\u003c\/strong\u003e: 5000 FPM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Range\u003c\/strong\u003e: -20 degrees F to 250 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Core\u003c\/strong\u003e: Polyester film laminate over corrosion-resistant steel wire helix\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation\u003c\/strong\u003e: Fiberglass blanket over fiberglass scrim\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Black polyethylene vapor barrier\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e: 5 years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 52306000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619824664882,"sku":"052306000002","price":78.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/11118821e918781295d9cda14d7153a7_9cd1b83a-3fac-4f28-9404-98cc3b87e3f1.webp?v=1787335077"},{"product_id":"thermaflex-53810000002-insulated-flex-duct-10in-x-25ft-r-6","title":"Thermaflex 53810000002 Insulated Flex Duct 10in X 25ft R-6","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe THERMAFLEX 53810000002 is an insulated flexible duct designed for air distribution in residential and light commercial HVAC systems. Supplied in a 25-foot length with a 10-inch diameter, it features an R-6 insulation rating that reduces thermal loss in both supply and return air applications. The silver jacket finish provides a vapor barrier and protects the insulation core during installation and service. Licensed HVAC technicians and sheet metal contractors install this product as a final branch run connecting supply plenums or trunk lines to diffusers and registers.\u003c\/p\u003e\u003cp\u003eThis flex duct is suited for residential forced-air heating and cooling installations as well as light commercial retrofit and new-construction projects. It is typically routed through unconditioned spaces such as attics, crawlspaces, and mechanical rooms where thermal performance of the duct run directly affects system efficiency. The R-6 rating makes it appropriate for climate zones that require higher insulation values under current energy codes.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eR-6 insulation rating limits heat transfer in unconditioned spaces\u003c\/li\u003e\n\u003cli\u003e10-inch diameter fits standard residential and light commercial supply trunk connections\u003c\/li\u003e\n\u003cli\u003e25-foot length per bag reduces the number of joints needed on longer runs\u003c\/li\u003e\n\u003cli\u003eSilver jacket acts as an integrated vapor barrier\u003c\/li\u003e\n\u003cli\u003eFlexible construction allows routing around obstructions without rigid fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation flex duct for residential and light commercial forced-air HVAC systems using 10-inch round duct connections.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician in accordance with ACCA Manual D duct design guidelines and applicable local mechanical codes. Power down the air handler or furnace at the disconnect before making duct connections. Secure each end of the flex duct with an approved clamp and mastic sealant or UL 181B-listed tape — never use standard cloth duct tape. Avoid sharp bends, compression, or excessive sag, as these conditions significantly reduce airflow and system efficiency.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 10 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation R-Value\u003c\/strong\u003e: R-6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJacket Color\u003c\/strong\u003e: Silver\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 53810000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619910582578,"sku":"053810000002","price":105.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ab378ee90362b84d71e45c7138a33419.png?v=1787337072"},{"product_id":"thermaflex-54704000002-flex-vent-insulated-flex-duct-4in-25ft-r4-2","title":"Thermaflex 54704000002 Flex-vent Insulated Flex Duct 4in 25ft R4.2","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe THERMAFLEX 54704000002 is an insulated flexible air duct from the Flex-Vent KP Series, designed for residential and light commercial HVAC distribution systems. This duct measures 4 inches in diameter and comes in a 25-foot length, making it suitable for branch runs from a plenum or trunk line to diffusers and registers. The R4.2 insulation value helps limit heat gain and loss across the duct run. It carries a 5,000 feet-per-minute velocity rating and is rated for operating temperatures from -20 degrees F to 250 degrees F. The inner core and jacket are constructed of polyester and steel. Domestic HVAC contractors and sheet metal mechanics are the primary installers.\u003c\/p\u003e\u003cp\u003eThis flexible duct is used in forced-air heating and cooling systems where a semi-rigid or hard-pipe run is impractical. Typical applications include connecting supply boots to trunk lines in residential attics, crawlspaces, and dropped ceilings, as well as light commercial VAV box connections. The 10 inch-WG positive and 0.5 inch-WG negative pressure ratings accommodate standard residential blower pressures without collapse or blow-out. The black outer jacket and polyester-steel construction handle the temperature swings common in unconditioned attic installations. A vapor transmission rating of 0.1 perm limits moisture migration through the duct wall in humid climates.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e4-inch diameter, 25-foot length for branch-run supply applications\u003c\/li\u003e\n\u003cli\u003eR4.2 insulation value reduces heat transfer across the duct wall\u003c\/li\u003e\n\u003cli\u003e5,000 fpm velocity rating supports standard residential and light commercial blower outputs\u003c\/li\u003e\n\u003cli\u003e10 inch-WG positive pressure and 0.5 inch-WG negative pressure rated\u003c\/li\u003e\n\u003cli\u003eOperating range of -20 degrees F to 250 degrees F suits unconditioned attic and crawlspace installs\u003c\/li\u003e\n\u003cli\u003e0.1 perm vapor transmission rating for moisture control in humid environments\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style flexible duct replacement or new-installation component for 4-inch supply branch runs in residential and light commercial forced-air HVAC systems.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eFlexible duct installation is typically performed by licensed HVAC contractors or sheet metal mechanics in accordance with SMACNA flexible duct performance and installation standards. Power down and lock out the air handler before connecting or disconnecting duct sections. Limit bends to maintain the duct as straight and fully extended as possible, as sharp bends and compression significantly increase static pressure drop. Secure all connections with approved clamps or ties and seal with mastic or listed tape per local mechanical code requirements.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R4.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVelocity Rating\u003c\/strong\u003e: 5,000 fpm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositive Pressure Rating\u003c\/strong\u003e: 10 inch-WG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNegative Pressure Rating\u003c\/strong\u003e: 0.5 inch-WG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature Range\u003c\/strong\u003e: -20 degrees F to 250 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVapor Transmission\u003c\/strong\u003e: 0.1 perm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Polyester and Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin\u003c\/strong\u003e: Domestic\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 54704000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619988930866,"sku":"054704000002","price":45.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/299ad48924e926edcc160e671f20d98c_54e704be-4bc0-46a8-a221-1ffc28d6883e.jpg?v=1787338309"},{"product_id":"thermaflex-53709000002-insulated-flex-duct-9-in-x-25-ft-r-4-2","title":"Thermaflex 53709000002 Insulated Flex Duct 9 in X 25 Ft R-4.2","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe THERMAFLEX 53709000002 is a 9-inch diameter, 25-foot insulated flexible air duct designed for low- to medium-pressure HVAC distribution systems. The KM series innercore is constructed from a smooth polyester film laminated over a heavy-gauge, corrosion-resistant steel wire helix. This design maintains duct shape under normal system pressures while delivering an airtight airflow path. A thick fiberglass insulation blanket surrounds the core, rated at R-4.2, providing thermal resistance to reduce heat gain or loss between the air handler and diffuser. HVAC technicians and sheet metal contractors install this product in residential and light commercial ducted systems.\u003c\/p\u003e\u003cp\u003eThis flexible duct is suited for branch-run applications in forced-air heating and cooling systems, including residential new construction and retrofit installations. It is commonly routed from a main trunk line or plenum to individual supply registers. The 9-inch diameter accommodates higher-volume supply runs typical in larger residential zones or light commercial spaces. The 25-foot coil length reduces the need for mid-run connections on longer branch runs, minimizing potential leakage points.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eR-4.2 fiberglass insulation blanket reduces heat transfer along the duct run\u003c\/li\u003e\n\u003cli\u003eSmooth polyester film innercore supports low-friction airflow in low- to medium-pressure systems\u003c\/li\u003e\n\u003cli\u003eHeavy-gauge, corrosion-resistant steel wire helix maintains duct shape and prevents collapse\u003c\/li\u003e\n\u003cli\u003eBi-directional reinforced metallized outer vapor barrier resists moisture infiltration and will not unravel\u003c\/li\u003e\n\u003cli\u003e25-foot coil length reduces mid-run splices on longer branch applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style flexible duct for residential and light commercial forced-air supply distribution systems with 9-inch round duct connections operating at low to medium static pressure.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician or qualified sheet metal contractor in accordance with ACCA Manual D and applicable local mechanical codes. Power down the air handling system at the disconnect or breaker before making duct connections. Avoid sharp bends and keep the duct as fully extended as practical to minimize airflow restriction and condensation risk. Secure both ends with approved draw bands and mastic or listed duct tape rated for flexible duct applications.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 9 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation R-Value\u003c\/strong\u003e: R-4.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Type\u003c\/strong\u003e: Fiberglass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInnercore Material\u003c\/strong\u003e: Polyester film over steel wire helix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Jacket\u003c\/strong\u003e: Bi-directional reinforced metallized vapor barrier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: Low to medium pressure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THERMAFLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 53709000002\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THERMAFLEX","offers":[{"title":"Default Title","offer_id":51619991978290,"sku":"053709000002","price":32.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ba73609c661d3af6eda9ba9ebe4fabd3_99765a60-f80e-4464-b5cb-d9380dc8c807.webp?v=1787338378"}],"url":"https:\/\/voomisupply.com\/collections\/thermaflex.oembed","provider":"Voomi Supply","version":"1.0","type":"link"}