Gray Flex 09-4GF-6_BAG Silver Insulated Flex Duct R6 9 Inches X 25 Feet

Product Description

The Gray Flex 09-4GF-6_BAG is a 9-inch diameter silver insulated flexible air duct rated at R6, sold in a 25-foot bag. This product is part of the Gray Flex 4GF-6 series, which is tested and listed in accordance with U.L. 181 as a Class 1 air duct material. HVAC technicians and installers rely on this type of flexible duct for connecting air handlers, plenums, diffusers, and branch runs in residential and light commercial duct systems. The R6 insulation value makes it well suited for applications where energy efficiency and condensation control are priorities, such as attic installations, crawl spaces, and unconditioned mechanical rooms. The outer jacket is a scrim-reinforced metalized polyester vapor barrier that resists moisture intrusion and provides a durable, reflective surface. The jacketing is printed every 24 inches with a certification label, foot markers, duct size, and performance data, making layout and inspection straightforward. Foot markers repeat every 12 inches for precise cutting in the field. The inner core is Gray Flex's exclusive patented reinforced liner, designed to maintain airflow performance and resist collapse under both positive and negative pressure. Fiberglass insulation is a minimum of 2 inches thick on the 4GF-6 model, delivering consistent thermal performance across the full length of the duct run. The duct is rated for operating temperatures from -20F to 250F, covering the full range of typical HVAC supply and return air conditions. Maximum pressure rating is 10 inches positive and 3/4 inches W.G. negative per U.L. 181, making it compatible with standard residential and commercial air distribution systems. The maximum flame spread rating is 25 and maximum smoke developed rating is 50, meeting the fire safety requirements for Class 1 flexible duct materials. This 9-inch by 25-foot bag format is ideal for larger trunk-to-register runs and high-volume supply applications where bigger duct diameters are required.

• U.L. 181 Class 1 listed flexible insulated air duct with R6 thermal performance
• Scrim-reinforced metalized polyester vapor barrier jacket with printed foot markers and certification labels every 24 inches
• Exclusive patented reinforced inner liner rated from -20F to 250F with a maximum pressure of 10 inches positive and 3/4 inches W.G. negative

Product Highlights

The Gray Flex 09-4GF-6_BAG delivers R6 insulated flexible duct performance in a 9-inch by 25-foot format, built to U.L. 181 Class 1 standards for reliable, code-compliant air distribution in residential and commercial HVAC installations.

Product Information

Standard Information

• Brand: GRAY FLEX
• Manufacturer Part Number: 09-4GF-6_BAG

Technical Specifications

• Flex Type: Insulated
• Inside Diameter: 9 inches
• R-Value: R6
• Length: 25 feet
• Insulated: Yes
• Core Material: Exclusive Patented Inner Core
• Maximum Pressure: 10 inches positive, 3/4 inches W.G. negative
• Operating Temperature Range: -20F to 250F (-28.8C to 121.1C)
• Fire Rating: Maximum flame spread 25, maximum smoke developed 50
• Pressure Rating: 10 inches positive, 3/4 inches W.G. negative per U.L. 181
• UPC: 687410304173