Gray Flex 07-4GF-8_BAG Silver Insulated Flex Duct R8 7 Inches X 25 Ft

Product Description

The Gray Flex 07-4GF-8_BAG is a silver insulated flexible air duct with an R-8 insulation value, sold in a 25-foot bag and sized at 7 inches in inside diameter. This product is designed for residential and light commercial HVAC installations where thermal efficiency and air delivery performance are critical. Flexible duct is one of the most commonly installed duct types in forced-air heating and cooling systems, connecting supply plenums or branch takeoffs to diffusers, registers, and grilles throughout a structure. The Gray Flex 07-4GF-8_BAG meets U.L. 181 standards and is approved as a Class 1 air duct material, making it compliant for use in a wide range of code-governed installations. The outer jacket is a scrim-reinforced metalized polyester vapor barrier that resists moisture intrusion and reflects radiant heat. It is printed with a certification label, foot markers, duct size, and performance data every 24 inches, with additional foot markers every 12 inches, making layout and cutting straightforward on the job site. The inner core uses an exclusive patented reinforced inner liner designed to be airtight, which helps reduce conditioned air loss and supports system efficiency. The fiberglass insulation layer for the 4GF-8 model is a minimum of 2 and 5 eighths inches thick, delivering the R-8 thermal resistance value that limits heat gain or loss as air travels through unconditioned spaces like attics and crawlspaces. The duct is rated for a maximum positive pressure of 10 inches and a negative pressure of three quarters of an inch water gauge, per U.L. 181. It operates across a temperature range of -20 degrees F to 250 degrees F, handling the full demands of typical HVAC airflow. The fire rating limits flame spread to a maximum of 25 and smoke development to a maximum of 50, meeting standard building code safety thresholds. HVAC installers, sheet metal contractors, and mechanical contractors will find this duct suitable for new construction, renovation, and replacement work where a high-R insulated flex duct is specified.

• Rated R-8 insulation value with a minimum 2 and 5 eighths inches thick fiberglass insulation layer for reduced heat transfer in unconditioned spaces
• Meets U.L. 181 Class 1 air duct standards with a flame spread rating of 25 and smoke developed rating of 50
• Scrim-reinforced metalized polyester vapor barrier jacket with printed certification labels, size markings, and foot markers every 12 inches

Product Highlights

The Gray Flex 07-4GF-8_BAG delivers high-performance R-8 insulated flexible ducting in a 7-inch diameter, 25-foot bag format, built to U.L. 181 Class 1 standards for reliable, code-compliant HVAC air distribution in residential and commercial applications.

Product Information

Standard Information

• Brand: GRAY FLEX
• Manufacturer Part Number: 07-4GF-8_BAG

Technical Specifications

• Inside Diameter: 7 inches
• Length: 25 feet
• R-Value: R8
• Flex Type: Insulated
• Core Material: Exclusive Patented Inner Core
• Insulation Thickness: Minimum 2 and 5 eighths inches
• Jacket Material: Scrim-Reinforced Metalized Polyester Vapor Barrier
• Maximum Pressure: 10 inches positive, 3/4 inches W.G. negative per U.L. 181
• Operating Temperature Range: -20F to 250F
• Fire Rating: Maximum flame spread 25, maximum smoke developed 50
• UL Listing: U.L. 181 Class 1 Air Duct
• UPC: 687410304272