Gray Flex 04-4GF-8_BAG Silver Insulated Flex Duct R8 4 Inches X 25 Foot Bag

Product Description

The Gray Flex 04-4GF-8_BAG is a 4-inch diameter, R8 insulated flexible air duct sold in a 25-foot bag. It is designed for use in residential and commercial HVAC systems where high thermal performance and reliable airflow are required. HVAC installers and sheet metal contractors rely on insulated flex duct to connect air handlers, plenums, and diffusers throughout supply and return air distribution systems. This product meets the demands of modern energy-efficient construction by delivering a strong R-8.0 thermal resistance value, helping to reduce heat gain and heat loss through the ductwork. The Gray Flex 04-4GF-8_BAG is tested and listed in accordance with UL 181 as a Class 1 air duct material, making it suitable for use in a wide range of residential, light commercial, and commercial HVAC applications. The outer jacket is a scrim-reinforced metalized polyester vapor barrier that resists moisture infiltration and provides a clean, professional appearance after installation. Certification labels, foot markers, size, and performance data are printed directly on the jacket every 24 inches, with foot markers every 12 inches, making it easy to cut and measure on the job site without extra tools. The fiberglass insulation layer on this model is a minimum of 2 and 5 eighths inches thick, which is what delivers the R-8.0 insulation rating. The airtight core uses Gray Flex's exclusive patented reinforced inner liner, which maintains shape under airflow pressure and resists collapsing during installation. This duct is rated for operating temperatures from -20 degrees Fahrenheit to 250 degrees Fahrenheit, covering the full range of heating and cooling conditions found in standard forced-air systems. The maximum positive pressure rating is 10 inches and the negative pressure rating is 3/4 inches W.G. per UL 181. Whether you are installing a new system or replacing deteriorated duct sections, the Gray Flex 04-4GF-8_BAG delivers dependable performance in a convenient bagged format.

• UL 181 Class 1 listed flexible air duct rated at R-8.0 thermal resistance for high-efficiency HVAC installations
• Scrim-reinforced metalized polyester jacket acts as a vapor barrier and provides printed foot markers every 12 inches for easy field measuring and cutting
• Exclusive patented reinforced inner liner core maintains airtight performance at pressures up to 10 inches positive and 3/4 inches W.G. negative

Product Highlights

The Gray Flex 04-4GF-8_BAG delivers Class 1, UL 181-listed R-8.0 insulated flex duct performance in a 4-inch by 25-foot bag, built with a patented inner liner and metalized vapor barrier jacket for reliable HVAC duct installations.

Product Information

Standard Information

• Brand: GRAY FLEX
• Manufacturer Part Number: 04-4GF-8_BAG

Technical Specifications

• Inside Diameter: 4 inches
• R-Value: R8
• Flex Type: Insulated
• Insulated: Yes
• Core Material: Exclusive Patented Inner Core
• Maximum Temperature: -20F to 250F (-28.89C to 121.11C)
• 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: 687410304241