Gray Flex 14-4GF-6_BAG Silver Insulated Flex Duct R6 14 Inches X 25 Feet

Product Description

The Gray Flex 14-4GF-6_BAG is a silver insulated flexible air duct with an R-6.0 thermal rating, measuring 14 inches in inside diameter and 25 feet in length. This product is designed for HVAC installers, sheet metal contractors, and mechanical tradespeople who need a reliable, code-compliant flexible duct solution for residential and light commercial air distribution systems. The duct is tested in accordance with U.L. 181 and approved for use as a Class 1 air duct material, making it suitable for supply and return air applications where fire and smoke performance standards must be met. The outer jacket is printed with a certification label, foot markers, size data, and performance data every 24 inches, with additional foot markers every 12 inches for easy field measurement during installation. The jacket itself is a scrim-reinforced metalized polyester vapor barrier that resists moisture and helps maintain thermal performance throughout the duct run. The airtight core uses Gray Flex's exclusive patented reinforced inner liner, which helps minimize air leakage and maintain consistent airflow across the length of the duct. Fiberglass insulation in the 4GF-6 model is a minimum of 2 inches thick, delivering the R-6.0 thermal resistance value that meets or exceeds many local energy codes for flex duct insulation in conditioned and unconditioned spaces. This duct is rated for operating temperatures from -20F to 250F, making it compatible with both heating and cooling systems. The maximum pressure rating is 10 inches positive and 3/4 inches W.G. negative per U.L. 181, covering most residential and light commercial HVAC pressure requirements. HVAC technicians and installers will find this duct well-suited for connecting air handlers, plenums, and diffusers in attics, crawlspaces, and mechanical rooms. The R-6 insulation level helps reduce thermal loss in unconditioned spaces, improving overall system efficiency. The 14-inch diameter is a common size for trunk line connections and large supply runs in commercial and larger residential systems.

• U.L. 181 tested and approved as a Class 1 air duct material with a maximum flame spread of 25 and maximum smoke developed of 50
• R-6.0 insulation value with a minimum fiberglass insulation thickness of 2 inches and scrim-reinforced metalized polyester vapor barrier jacket
• Rated for operating temperatures from -20F to 250F and pressures up to 10 inches positive and 3/4 inches W.G. negative

Product Highlights

The Gray Flex 14-4GF-6_BAG delivers U.L. 181 Class 1 compliance, R-6.0 thermal performance, and a patented airtight core in a 14-inch diameter flex duct built for demanding HVAC installation work.

Product Information

Standard Information

• Brand: GRAY FLEX
• Manufacturer Part Number: 14-4GF-6_BAG

Technical Specifications

• Flex Type: Insulated
• Inside Diameter: 14 inches
• Length: 25 feet
• R-Value: R6
• Insulation Thickness: Minimum 2 inches fiberglass
• Core Material: Exclusive patented reinforced inner liner
• Jacket Material: Scrim-reinforced metalized polyester vapor barrier
• Operating Temperature Range: -20F to 250F (-28.8C to 121.1C)
• Maximum Pressure: 10 inches positive, 3/4 inches W.G. negative per U.L. 181
• Fire Rating: Maximum flame spread 25, maximum smoke developed 50
• Listing Standard: U.L. 181 Class 1 air duct material
• UPC: 687410304203