Gray Flex 14-4GF-8_BAG Silver Insulated Flex Duct R8 14 Inches X 25 Feet

Product Description

The Gray Flex 14-4GF-8_BAG is a silver insulated flexible air duct rated at R8, measuring 14 inches in inside diameter and 25 feet in length. This product is designed for HVAC installation professionals who need a reliable, high-performance flex duct that meets strict industry standards. It is tested in accordance with U.L. 181 and approved for use as a Class 1 air duct material, making it a code-compliant choice for residential and commercial duct systems. The R8 insulation value means this duct provides excellent thermal resistance, helping to reduce energy loss and maintain conditioned air temperatures as air travels through the duct run. HVAC technicians and mechanical contractors rely on insulated flex duct like this one for supply air distribution in tight or hard-to-reach spaces where rigid duct is not practical. The jacketing is a scrim-reinforced metalized polyester vapor barrier, which resists moisture infiltration and helps protect the fiberglass insulation core from performance degradation. The outer 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 faster and measurement verification easy in the field. The airtight inner core uses Gray Flex's exclusive patented reinforced inner liner, which supports airflow integrity and durability under real-world HVAC operating conditions. The fiberglass insulation on the 4GF-8 model is a minimum of 2 and 5 eighths inches thick, delivering the R8 thermal performance that modern energy codes increasingly require. This duct handles temperatures from -20F to 250F and is pressure-rated at 10 inches positive and 3 fourths inches W.G. negative per U.L. 181, giving installers confidence across a wide range of system conditions. It is sold as a bagged unit, 25 feet per bag, well-suited for stocking on HVAC service vehicles or in supply house inventory.

• U.L. 181 tested and approved as a Class 1 air duct material for code-compliant HVAC installations
• R8 insulation rating with minimum 2 and 5 eighths inches thick fiberglass insulation for superior thermal performance
• Scrim-reinforced metalized polyester vapor barrier jacket with printed foot markers and certification data every 24 inches

Product Highlights

The Gray Flex 14-4GF-8_BAG delivers R8-rated, U.L. 181-approved insulated flex duct in a 14-inch diameter, 25-foot length, built for HVAC professionals who need a thermally efficient and code-compliant air distribution solution.

Product Information

Standard Information

• Brand: GRAY FLEX
• Manufacturer Part Number: 14-4GF-8_BAG

Technical Specifications

• Flex Type: Insulated
• Inside Diameter: 14 inches
• Length: 25 feet
• R-Value: R8
• Insulated: Yes
• Core Material: Exclusive patented reinforced inner liner
• Insulation Thickness: Minimum 2 and 5 eighths inches
• Maximum Temperature Range: -20F to 250F (-28.89C to 121.11C)
• Maximum Pressure: 10 inches positive, 3 fourths inches W.G. negative
• Pressure Rating: 10 inches positive, 3 fourths inches W.G. negative per U.L. 181
• Fire Rating: Maximum flame spread 25, maximum smoke developed 50
• UPC: 687410304326