{"product_id":"gray-flex-16-4gf-8_bag-silver-insulated-flex-duct-r8-16-inches-x-25-foot-bag","title":"Gray Flex 16-4GF-8_BAG Silver Insulated Flex Duct R8 16 Inches X 25 Foot Bag","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe Gray Flex 16-4GF-8_BAG is a silver insulated flexible air duct with an R-8 insulation value, sold in a 25-foot bag. It is designed for use as a Class 1 air duct material and is tested and listed under UL 181. HVAC contractors, sheet metal workers, and mechanical installers rely on this type of insulated flex duct for residential and commercial ductwork systems. The 16-inch inside diameter makes it well-suited for larger trunk runs and high-volume air distribution applications.\u003c\/p\u003e\u003cp\u003eThe inner core uses an exclusive patented reinforced liner that forms an airtight seal to minimize air leakage. This helps maintain system efficiency and supports compliance with energy codes that require low duct leakage. The fiberglass insulation layer is a minimum of 2 and 5\/8 inches thick on the 4GF-8 model, delivering the full R-8.0 thermal resistance rating. The outer jacket is a scrim-reinforced metalized polyester vapor barrier with a silver finish. The jacket is printed with a certification label, foot markers, size data, and performance data every 24 inches, with foot markers every 12 inches, making installation measurement fast and accurate on the job site.\u003c\/p\u003e\u003cp\u003eThis duct meets a wide range of building and fire code requirements including UL 181, NFPA 90A and 90B, SBCC, HUD 515-2.1, BOCA, ACCA, and ADC. The maximum flame spread rating is 25 and the maximum smoke developed rating is 50, meeting standard Class 1 air duct requirements. The duct handles operating temperatures from -20 degrees Fahrenheit to 250 degrees Fahrenheit and supports a maximum air velocity of 5,500 feet per minute. Pressure rating is 10 inches positive and 3\/4 inches W.G. negative per UL 181. Manufactured in the USA.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e16-inch inside diameter insulated flex duct with R-8.0 thermal resistance, ideal for larger HVAC duct runs\u003c\/li\u003e\n\u003cli\u003eUL Listed and compliant with UL 181, NFPA 90A and 90B, SBCC, BOCA, ACCA, ADC, and HUD 515-2.1\u003c\/li\u003e\n\u003cli\u003eScrim-reinforced metalized polyester vapor barrier jacket with printed foot markers every 12 inches for fast field measurement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\u003cp\u003eThe Gray Flex 16-4GF-8_BAG delivers R-8 insulated flex duct performance in a 16-inch diameter, 25-foot length. It is UL Listed, built with a patented airtight inner core, and meets major national and regional building code standards for Class 1 air duct installations.\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: 16-4GF-8_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: 16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlex Length\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR-Value\u003c\/strong\u003e: R8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Thickness\u003c\/strong\u003e: Minimum 2 and 5\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJacket Color\u003c\/strong\u003e: Silver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJacket Material\u003c\/strong\u003e: Scrim Reinforced Metalized Polyester Vapor Barrier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Material\u003c\/strong\u003e: Exclusive Patented Inner Core\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlex Type\u003c\/strong\u003e: Insulated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Air Flow\u003c\/strong\u003e: 5,500 FPM\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\u003eOperating Temperature Range\u003c\/strong\u003e: -20F to 250F (-28.8C to 121.1C)\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\u003eApprovals\u003c\/strong\u003e: UL Listed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompliance\u003c\/strong\u003e: UL 181, SBCC, NFPA 90A and 90B, HUD 515-2.1, BOCA, ACCA, ADC, ETL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVapor Transmission\u003c\/strong\u003e: Jacket only 0.1 (max 0.3) perms per ASTM C96A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e: USA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Type\u003c\/strong\u003e: Bag\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 35 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC\u003c\/strong\u003e: 687410304333\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GRAY FLEX","offers":[{"title":"Default Title","offer_id":51121071489330,"sku":"16-4GF-8_BAG","price":160.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/304885177.webp?v=1777747551","url":"https:\/\/voomisupply.com\/products\/gray-flex-16-4gf-8_bag-silver-insulated-flex-duct-r8-16-inches-x-25-foot-bag","provider":"Voomi Supply","version":"1.0","type":"link"}