Southwark Metal 90726A Silver Insulated Flex Duct R8 8 Inches X 25 Feet

Product Description

The SOUTHWARK METAL 90726A is an R8 insulated flexible air duct designed for residential and light commercial HVAC installations. This 8-inch diameter duct comes in a 25-foot bag and is built to deliver reliable, energy-efficient airflow from air handlers, furnaces, and plenum boxes to supply registers and grilles. HVAC contractors, sheet metal workers, and mechanical installers rely on flex duct like the 90726A for its ease of routing through tight spaces, attics, crawlspaces, and wall cavities where rigid ductwork is impractical. The R8 insulation rating makes this duct well suited for installations requiring higher thermal performance, including energy-code-compliant systems in newer construction and retrofit projects in extreme climates. The fiberglass insulation layer is a minimum of 2 and 5/8 inches thick, providing substantial resistance to heat gain and heat loss in both heating and cooling applications. The inner core is Southwark Metal exclusive patented reinforced liner that forms an airtight seal, reducing air leakage and improving system efficiency. The outer jacket is a scrim-reinforced metalized polyester vapor barrier that resists moisture intrusion and physical wear during installation. The jacketing is printed with certification labels, foot markers every 12 inches, and size and performance data every 24 inches, making field measurements fast and accurate. This flex duct is tested and listed in accordance with UL 181 and approved as a Class 1 air duct material, meeting fire and safety standards required by most building codes and inspection authorities. The maximum flame spread rating is 25 and the maximum smoke developed rating is 50, which are within Class 1 limits. The duct operates across a temperature range of -20F to 250F, making it compatible with standard forced-air heating and cooling systems. The pressure rating is 10 inches positive and 3/4 inches W.G. negative per UL 181, supporting typical residential and light commercial static pressure conditions. This product is a go-to choice for HVAC professionals who need a code-compliant, high-R-value flex duct solution for supply air applications.

• R8 insulation rating with a minimum 2 and 5/8 inches thick fiberglass insulation layer for energy-efficient duct runs
• UL 181 listed Class 1 air duct material with a maximum flame spread of 25 and maximum smoke developed of 50
• Scrim-reinforced metalized polyester vapor barrier jacket with printed foot markers every 12 inches and certification data every 24 inches

Product Highlights

The Southwark Metal 90726A is a UL 181 Class 1 listed R8 insulated flex duct in an 8-inch diameter, 25-foot bag, built for HVAC professionals who need reliable thermal performance and code compliance in supply air duct systems.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 90726A

Technical Specifications

• Inside Diameter: 8 inches
• Length: 25 feet
• R-Value: R8
• Flex Type: Insulated
• Core Material: Exclusive patented reinforced inner liner
• Insulation Thickness: Minimum 2 and 5/8 inches fiberglass
• Outer Jacket: Scrim-reinforced metalized polyester vapor barrier
• Fire Rating: Maximum flame spread 25, maximum smoke developed 50
• UL Listing: UL 181 Class 1 air duct material
• Maximum Pressure: 10 inches positive, 3/4 inches W.G. negative
• Operating Temperature Range: -20F to 250F
• UPC: 687410304289