Gray Flex 08-4GF-6_BAG Silver Insulated Flex Duct R6 8 Inches X 25 Feet

Product Description

The Gray Flex 08-4GF-6_BAG is a silver insulated flexible air duct rated at R6, designed for residential and commercial HVAC installations. This duct measures 8 inches in inside diameter and comes in a 25-foot bag, making it a practical choice for HVAC technicians who need a reliable, code-compliant flex duct solution. The 4GF-6 model carries an R-6.0 insulation value, delivered through a minimum 2-inch thick fiberglass insulation layer wrapped around an exclusive patented reinforced inner liner. This airtight core is engineered to maintain consistent airflow and resist pressure fluctuations common in forced-air systems. The outer jacket is a scrim-reinforced metalized polyester vapor barrier that protects the insulation from moisture intrusion and physical damage during installation. The jacketing is printed with a certification label, foot markers every 12 inches, and size and performance data every 24 inches, so installers can measure and cut accurately without additional tools. This flex duct is tested and listed in accordance with U.L. 181 standards and approved for use as a Class 1 air duct material. It carries a maximum flame spread rating of 25 and a maximum smoke developed rating of 50, meeting the fire safety requirements demanded in residential and light commercial HVAC work. The operating temperature range runs from -20F to 250F, covering both heating and cooling applications across a wide range of climate conditions. The pressure rating allows up to 10 inches positive and 3/4 inches W.G. negative per U.L. 181, making it suitable for standard ducted HVAC systems. Whether you are replacing old flex duct, extending a branch run, or installing a new system, the Gray Flex 08-4GF-6_BAG delivers the insulation performance, airflow efficiency, and code compliance that trade professionals depend on. Its metalized silver jacket also resists radiant heat gain in unconditioned spaces like attics and crawlspaces.

• R6 insulation value with a minimum 2-inch thick fiberglass insulation layer for efficient thermal performance
• UL 181 Class 1 rated with flame spread of 25 and smoke developed of 50 for code-compliant installations
• Scrim-reinforced metalized polyester vapor barrier jacket with printed foot markers every 12 inches for easy measurement

Product Highlights

The Gray Flex 08-4GF-6_BAG provides HVAC professionals with a UL 181 Class 1 certified, R6 insulated flexible duct in an 8-inch diameter that handles wide temperature swings and standard system pressures. It is a dependable, code-ready solution for branch runs and supply duct connections in residential and commercial forced-air systems.

Product Information

Standard Information

• Brand: GRAY FLEX
• Manufacturer Part Number: 08-4GF-6_BAG

Technical Specifications

• Inside Diameter: 8 inches
• Length: 25 feet
• R-Value: R6
• Flex Type: Insulated
• Core Material: Exclusive patented reinforced inner liner
• Insulation Thickness: Minimum 2 inches fiberglass
• Operating Temperature Range: -20F to 250F (-28.8C to 121.1C)
• Maximum Pressure: 10 inches positive, 3/4 inches W.G. negative
• Pressure Rating: 10 inches positive, 3/4 inches W.G. negative per U.L. 181
• Fire Rating: Maximum flame spread: 25; Maximum smoke developed: 50
• UPC: 687410304166