{"product_id":"gray-flex-08-4gf-6_bag-silver-insulated-flex-duct-r6-8-inches-x-25-feet","title":"Gray Flex 08-4GF-6_BAG Silver Insulated Flex Duct R6 8 Inches X 25 Feet","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe Gray Flex 08-4GF-6_BAG is a silver insulated flexible air duct rated at R6, designed for residential and commercial HVAC installations. This duct measures 8 inches in inside diameter and comes in a 25-foot bag, making it a practical choice for HVAC technicians who need a reliable, code-compliant flex duct solution. The 4GF-6 model carries an R-6.0 insulation value, delivered through a minimum 2-inch thick fiberglass insulation layer wrapped around an exclusive patented reinforced inner liner. This airtight core is engineered to maintain consistent airflow and resist pressure fluctuations common in forced-air systems. The outer jacket is a scrim-reinforced metalized polyester vapor barrier that protects the insulation from moisture intrusion and physical damage during installation. The jacketing is printed with a certification label, foot markers every 12 inches, and size and performance data every 24 inches, so installers can measure and cut accurately without additional tools. This flex duct is tested and listed in accordance with U.L. 181 standards and approved for use as a Class 1 air duct material. It carries a maximum flame spread rating of 25 and a maximum smoke developed rating of 50, meeting the fire safety requirements demanded in residential and light commercial HVAC work. The operating temperature range runs from -20F to 250F, covering both heating and cooling applications across a wide range of climate conditions. The pressure rating allows up to 10 inches positive and 3\/4 inches W.G. negative per U.L. 181, making it suitable for standard ducted HVAC systems. Whether you are replacing old flex duct, extending a branch run, or installing a new system, the Gray Flex 08-4GF-6_BAG delivers the insulation performance, airflow efficiency, and code compliance that trade professionals depend on. Its metalized silver jacket also resists radiant heat gain in unconditioned spaces like attics and crawlspaces.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eR6 insulation value with a minimum 2-inch thick fiberglass insulation layer for efficient thermal performance\u003c\/li\u003e\n\u003cli\u003eUL 181 Class 1 rated with flame spread of 25 and smoke developed of 50 for code-compliant installations\u003c\/li\u003e\n\u003cli\u003eScrim-reinforced metalized polyester vapor barrier jacket with printed foot markers every 12 inches for easy measurement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\u003cp\u003eThe Gray Flex 08-4GF-6_BAG provides HVAC professionals with a UL 181 Class 1 certified, R6 insulated flexible duct in an 8-inch diameter that handles wide temperature swings and standard system pressures. It is a dependable, code-ready solution for branch runs and supply duct connections in residential and commercial forced-air systems.\u003c\/p\u003e\u003ch3\u003eProduct Information\u003c\/h3\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: GRAY FLEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 08-4GF-6_BAG\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\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\u003eR-Value\u003c\/strong\u003e: R6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlex Type\u003c\/strong\u003e: Insulated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Material\u003c\/strong\u003e: Exclusive patented reinforced inner liner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Thickness\u003c\/strong\u003e: Minimum 2 inches fiberglass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature Range\u003c\/strong\u003e: -20F to 250F (-28.8C to 121.1C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Pressure\u003c\/strong\u003e: 10 inches positive, 3\/4 inches W.G. negative\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: 10 inches positive, 3\/4 inches W.G. negative per U.L. 181\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire Rating\u003c\/strong\u003e: Maximum flame spread: 25; Maximum smoke developed: 50\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC\u003c\/strong\u003e: 687410304166\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRAY FLEX","offers":[{"title":"Default Title","offer_id":51120926425394,"sku":"08-4GF-6_BAG","price":64.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/304885155.webp?v=1777743530","url":"https:\/\/voomisupply.com\/products\/gray-flex-08-4gf-6_bag-silver-insulated-flex-duct-r6-8-inches-x-25-feet","provider":"Voomi Supply","version":"1.0","type":"link"}