{"product_id":"atco-070-r4-2_9x25ft-flexible-air-duct-r4-2-9in-x-25ft","title":"Atco 070-R4.2_9X25FT Flexible Air Duct R4.2 9in X 25ft","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ATCO RUBBER PRODUCTS 070-R4.2_9X25FT is a Class 1 insulated flexible air duct designed for residential and light commercial HVAC distribution systems. The duct measures 9 inches in diameter and comes in a 25-foot length, offering R4.2 thermal performance via a thick blanket of fiberglass insulation wrapped around a 2-ply polyester inner core. The air-tight inner core prevents fiberglass erosion into the airstream, while the encapsulated wire helix keeps the duct intact when cut to length. Rated for 5000 FPM air velocity and 6 inches WG positive pressure per UL 181, this duct is built for reliable, low-friction airflow delivery. Licensed HVAC technicians and sheet metal contractors are the primary installers.\u003c\/p\u003e\n\u003cp\u003eThis flexible duct is suited for trunk-and-branch and radial HVAC distribution layouts in residential new construction and retrofit applications, as well as light commercial installations governed by IMC, IRC, UMC, and NFPA 90A and 90B. The plain end configuration allows for direct connection to standard round duct collars, boot fittings, and flex connectors without additional adapters. The gray polyester jacket resists tearing and puncture during handling and routing through tight spaces. The compact carton format simplifies jobsite staging and warehouse storage.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eR4.2 thick blanket fiberglass insulation for energy-efficient thermal performance\u003c\/li\u003e\n  \u003cli\u003eAir-tight 2-ply polyester inner core eliminates fiberglass erosion into the airstream\u003c\/li\u003e\n  \u003cli\u003eEncapsulated wire helix maintains duct integrity when cut to length, speeding installation\u003c\/li\u003e\n  \u003cli\u003eSmooth inner core reduces friction loss and lowers system operating costs\u003c\/li\u003e\n  \u003cli\u003eRated 5000 FPM air velocity and 6 inches WG positive pressure per UL 181\u003c\/li\u003e\n  \u003cli\u003eMeets UL 181, NFPA 90A and 90B, IMC, IRC, UMC, HUD, and ASTM C-158 standards\u003c\/li\u003e\n  \u003cli\u003eGray polyester jacket resists tearing and puncture for low-maintenance service life\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style Class 1 flexible air duct replacement or new-installation component for residential and light commercial forced-air HVAC systems using 9-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 IMC, IRC, NFPA 90A and 90B, and local mechanical codes. Shut down and lock out the air handling unit before connecting or disconnecting any duct sections. Secure all connections with approved clamps or draw bands and seal with listed mastic or UL 181B-listed tape — do not use standard cloth duct tape. Avoid sharp bends or kinking, as excessive deflection reduces airflow and can damage the inner core.\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 Type\u003c\/strong\u003e: Thick Blanket Fiberglass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation R-Value\u003c\/strong\u003e: R4.2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Material\u003c\/strong\u003e: 2-Ply Polyester\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eJacket Material\u003c\/strong\u003e: Gray Polyester\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAir Velocity Rating\u003c\/strong\u003e: 5000 FPM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRated Positive Pressure\u003c\/strong\u003e: 6 inches WG per UL 181\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRated Negative Pressure\u003c\/strong\u003e: 0.75 inches WG per UL 181\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Rating\u003c\/strong\u003e: -20 to 180 degrees F continuous, -20 to 250 degrees F intermittent\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlame Spread Index\u003c\/strong\u003e: 25 maximum\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmoke Developed Index\u003c\/strong\u003e: 50 maximum\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDuct Class\u003c\/strong\u003e: Class 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Type\u003c\/strong\u003e: Plain End\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplicable Standards\u003c\/strong\u003e: UL 181, NFPA 90A and 90B, IMC, IRC, UMC 10-1, HUD, ASTM C-158\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: ATCO RUBBER PRODUCTS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 070-R4.2_9X25FT\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ATCO RUBBER PRODUCTS","offers":[{"title":"Default Title","offer_id":51283990348082,"sku":"070-R4.2_9X25FT","price":71.53,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/309278149.jpg?v=1781065273","url":"https:\/\/voomisupply.com\/products\/atco-070-r4-2_9x25ft-flexible-air-duct-r4-2-9in-x-25ft","provider":"Voomi Supply","version":"1.0","type":"link"}