Gray Flex 08-4GF-8_BAG Silver Insulated Flex Duct R8 8 Inches X 25 Feet

Product Description

The Gray Flex 08-4GF-8_BAG is a silver insulated flexible air duct rated at R8, designed for residential and commercial HVAC installations. It ships in a convenient bag and measures 8 inches in diameter with a 25-foot length, making it a practical choice for medium to large duct runs. This flexible duct is built to meet the demands of professional HVAC technicians who need reliable, code-compliant ductwork that installs quickly and performs consistently over time. The product is tested in accordance with U.L. 181 standards and approved for use as a Class 1 air duct material, ensuring it meets strict safety and performance requirements recognized across the industry. The outer jacketing is a scrim-reinforced metalized polyester vapor barrier that resists moisture intrusion and protects the insulation layer from damage during and after installation. Certification labels, foot markers, size data, and performance information are printed directly on the jacket every 24 inches, with foot markers appearing every 12 inches, so installers can measure and cut with confidence on the job. At the core, Gray Flex uses an exclusive patented reinforced inner liner that creates a fully airtight passage for conditioned air. This airtight construction reduces air leakage, which directly improves system efficiency and lowers energy costs for building owners. The fiberglass insulation on the 4GF-8 model is a minimum of 2 and 5/8 inches thick, delivering a true R8 thermal performance value. This level of insulation is well suited for attic runs, crawlspaces, and other unconditioned areas where heat gain and heat loss must be minimized. The duct handles operating temperatures from -20F to 250F and a maximum positive pressure of 10 inches water gauge, giving it wide compatibility with standard residential and light commercial air handler systems. HVAC installers, mechanical contractors, and sheet metal professionals will find this product ready to connect to standard fittings and boots without special tools or adapters.

• U.L. 181 tested and approved as a Class 1 air duct material for safe, code-compliant installations
• Exclusive patented airtight reinforced inner liner reduces air leakage and improves HVAC system efficiency
• Scrim-reinforced metalized polyester vapor barrier jacket with printed certification labels and foot markers every 12 inches

Product Highlights

The Gray Flex 08-4GF-8_BAG delivers R8 thermal performance in an 8-inch diameter flexible duct that meets U.L. 181 Class 1 requirements, making it a dependable choice for professional HVAC duct runs in residential and commercial applications.

Product Information

Standard Information

• Brand: GRAY FLEX
• Manufacturer Part Number: 08-4GF-8_BAG

Technical Specifications

• Inside Diameter: 8 inches
• Length: 25 feet
• R-Value: R8
• Flex Type: Insulated
• Core Material: Exclusive patented reinforced inner liner
• Insulation Thickness: Minimum 2 and 5/8 inches
• Maximum Pressure: 10 inches positive, 3/4 inches W.G. negative
• Operating Temperature Range: -20F to 250F
• Fire Rating: Maximum flame spread 25, maximum smoke developed 50
• Certification: U.L. 181 Class 1 air duct material
• Jacket Material: Scrim-reinforced metalized polyester vapor barrier
• UPC: 687410304289