Gray Flex 12-4GF-6_BAG Silver Insulated Flex Duct R6 12 Inches X 25 Foot Bag

Product Description

The Gray Flex 12-4GF-6_BAG is a 12-inch diameter, R-6 insulated flexible air duct sold in a 25-foot bag. It is designed for use in residential and commercial HVAC systems where reliable airflow, thermal performance, and code compliance are required. HVAC contractors, sheet metal workers, and mechanical installers rely on insulated flex duct like this to connect air handling units, VAV boxes, registers, and grilles in tight or irregular spaces where rigid ductwork is not practical. The R-6 insulation rating on this product helps reduce heat gain and heat loss as conditioned air travels through the duct, improving overall system efficiency and occupant comfort. The fiberglass insulation on the 4GF-6 model is a minimum of 2 inches thick, providing a meaningful thermal barrier between the duct interior and the surrounding attic, plenum, or mechanical space. The outer jacket is a scrim-reinforced metalized polyester vapor barrier that resists condensation and moisture intrusion. This metallic silver jacketing is also printed every 24 inches with certification labels, foot markers, size data, and performance information, making installation faster and more accurate. Foot markers appear every 12 inches for precise measurement in the field. The airtight inner core is an exclusive patented reinforced liner that maintains round shape and resists collapse under normal operating conditions. This product is tested and listed in accordance with U.L. 181 and is approved as a Class 1 air duct material, meeting the requirements of most building codes and mechanical inspection standards. The duct handles temperatures from -20F to 250F and is rated for 10 inches positive pressure and 3 inches W.G. negative pressure. The flame spread rating is a maximum of 25 and smoke developed is a maximum of 50, consistent with Class 1 duct requirements. This 12-inch by 25-foot bag is a standard field format that works well for medium to large duct runs in residential new construction, light commercial, and HVAC replacement projects.

• R-6 insulation rating with a minimum 2-inch thick fiberglass insulation layer for improved thermal efficiency
• U.L. 181 listed Class 1 flexible air duct with a scrim-reinforced metalized polyester vapor barrier outer jacket
• Rated for temperatures from -20F to 250F and pressures up to 10 inches positive and 3 inches W.G. negative

Product Highlights

The Gray Flex 12-4GF-6_BAG delivers U.L. 181 Class 1 compliance, R-6 thermal performance, and a durable metalized vapor barrier jacket in a contractor-ready 25-foot bag. It is a dependable choice for insulated flex duct installations in HVAC systems requiring reliable airflow and energy efficiency.

Product Information

Standard Information

• Brand: GRAY FLEX
• Manufacturer Part Number: 12-4GF-6_BAG

Technical Specifications

• Flex Type: Insulated
• Inside Diameter: 12 inches
• R-Value: R6
• Insulation Thickness: Minimum 2 inches fiberglass
• Length: 25 feet per bag
• Core Material: Exclusive patented reinforced inner liner
• Outer Jacket: Scrim-reinforced metalized polyester vapor barrier
• Maximum Temperature: -20F to 250F (-28.89C to 121.11C)
• Maximum Pressure: 10 inches positive, 3 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
• UPC: 687410304197