Flexduct 1265 Flex Air Duct 12in R8 Insulation 25ft

Product Description

The FLEXDUCT 1265 is a 12-inch diameter flexible air duct rated at R8 insulation, designed for residential and light commercial HVAC distribution systems. Constructed with UV-inhibited fiberglass insulation and a black outer jacket, this duct is built to hold up in attic and exposed installation environments where sunlight exposure is a concern. At 25 feet per bag, it covers standard trunk-to-register runs in a single pull. HVAC installers rely on this class of duct to connect rigid sheet metal plenums and branch fittings to supply air registers while maintaining system efficiency.

This flex duct is suited for supply air distribution in forced-air residential and light commercial applications. The 12-inch diameter accommodates high-volume supply runs typically found in larger residential systems or commercial rooftop unit installations. The R8 insulation value meets or exceeds energy code requirements commonly enforced in climate zones with strict duct insulation mandates, making it appropriate for new construction, renovation, and equipment changeout projects.

Key Features

• 12-inch inner diameter for high-volume supply air distribution
• R8 fiberglass insulation for compliance with modern energy codes
• UV-inhibited outer jacket for durability in attic and exposed installations
• Black outer jacket resists degradation from incidental light exposure
• 25-foot length per bag reduces the need for mid-run splices on longer runs

Compatibility

Designed as an OEM-style replacement and new-installation flexible duct for 12-inch round fittings, collars, and takeoffs in residential and light commercial forced-air HVAC supply systems.

Installation Notes

Flexible duct installation is performed by licensed HVAC technicians and must comply with local mechanical codes and ACCA Manual D duct design guidelines. Power down the air handling unit at the disconnect before making duct connections. Secure each end with an approved draw band or clamp and seal with listed duct mastic or UL 181B-FX-listed tape — do not use standard cloth duct tape. Avoid sharp bends and compression; maintain the duct at or near full extension to preserve the rated airflow and R-value.

Technical Specifications

• Inner Diameter: 12 inches
• Length: 25 feet
• Insulation R-Value: R8
• Insulation Material: Fiberglass
• Outer Jacket: UV-inhibited black

Standard Information

• Brand: FLEXDUCT
• Manufacturer Part Number: 1265