Gray Flex 10-4GF-6_BAG Silver Insulated Flex Duct R6 10 Inches X 25 Ft Bag

Product Description

The Gray Flex 10-4GF-6_BAG is a silver insulated flexible air duct designed for residential and commercial HVAC installations. It ships as a 25-foot bag in a 10-inch inside diameter, giving HVAC contractors a ready-to-install duct run sized for larger trunk and branch applications. This product carries an R-6.0 insulation rating, meeting the energy efficiency requirements common in modern building codes and Title 24 applications.

The duct is tested and approved in accordance with U.L. 181, classifying it as a Class 1 air duct material. That certification matters on job sites where inspectors verify duct compliance. The outer jacket is a scrim-reinforced metalized polyester vapor barrier, which resists moisture migration and helps maintain insulation performance over the life of the system. Certification labels, foot markers, size data, and performance information are printed directly on the jacket every 24 inches, with foot markers repeating every 12 inches for easy field measurement and cutting.

The inner core is Gray Flex's exclusive patented reinforced liner, engineered to stay airtight under normal HVAC operating pressures. The duct handles up to 10 inches positive pressure and 3/4 inches W.G. negative pressure per U.L. 181 ratings. The fiberglass insulation wrapping the core is a minimum of 2 inches thick on this R-6.0 model, providing solid thermal separation between conditioned air and unconditioned spaces like attics, crawlspaces, and wall cavities.

Temperature performance spans from -20 degrees Fahrenheit to 250 degrees Fahrenheit, making it suitable for both heating and cooling systems in a wide range of climates. The fire rating meets standard requirements with a maximum flame spread of 25 and maximum smoke developed of 50. HVAC installers, mechanical contractors, and sheet metal workers will find this duct compatible with standard flex duct fittings and zip ties used in conventional air distribution systems.

• U.L. 181 Class 1 certified insulated flexible air duct with R-6.0 insulation value
• Scrim-reinforced metalized polyester vapor barrier jacket printed with foot markers every 12 inches and certification data every 24 inches
• Rated for -20F to 250F operating range and up to 10 inches positive pressure per U.L. 181

Product Highlights

The Gray Flex 10-4GF-6_BAG delivers a U.L. 181 certified, R-6.0 insulated flex duct in a 10-inch by 25-foot bag, combining a patented airtight inner core with a vapor barrier jacket built for dependable performance in residential and commercial HVAC air distribution systems.

Product Information

Standard Information

• Brand: GRAY FLEX
• Manufacturer Part Number: 10-4GF-6_BAG

Technical Specifications

• Inside Diameter: 10 inches
• Length: 25 feet
• R-Value: R6
• Flex Type: Insulated
• Core Material: Exclusive Patented Inner Core
• Insulation Thickness: Minimum 2 inches
• Jacket: Scrim Reinforced Metalized Polyester Vapor Barrier
• 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
• UPC: 687410304180