Atco FD-12X25-R6FB Flex Duct 12 in X 25 Ft R-6 Insulated

Product Description

The ATCO RUBBER PRODUCTS FD-12X25-R6FB is a 12-inch diameter, 25-foot flexible air duct with R-6 insulation, built for low-to-medium operating pressure HVAC applications. The outer jacket is constructed from a tri-directional fiberglass scrim reinforced, metallized polyester laminate that resists puncture and moisture. The inner core is air-tight and engineered to maintain consistent airflow with minimal leakage. This product carries UL 181 Class 1 Air Duct certification, meeting the code requirements that licensed HVAC technicians encounter on residential and light commercial jobs. The R-6 insulation value delivers strong thermal performance, reducing heat gain and loss through the duct run.

This flexible duct is suited for residential and light commercial HVAC installations where a pre-insulated, UL-listed flex duct is required. Typical applications include branch runs from a plenum or trunk line to supply registers, installations in attic spaces, and other areas where rigid ductwork is impractical. The 25-foot bag length gives technicians enough material to handle most standard branch runs without splicing. The metallized outer jacket performs well in unconditioned spaces where temperature swings and vapor drive are a concern.

Key Features

• UL 181 Class 1 Air Duct rated for code-compliant HVAC installations
• Tri-directional fiberglass scrim reinforced metallized polyester outer jacket for durability and vapor resistance
• Air-tight inner core designed for low-to-medium operating pressures
• R-6 insulation value for superior thermal performance in unconditioned spaces
• 12-inch diameter x 25-foot length covers most residential branch run requirements

Compatibility

Designed as a UL 181 Class 1 compliant flexible duct replacement or new-installation product for residential and light commercial HVAC supply systems operating at low-to-medium static pressures.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Power down and lock out the air handler before connecting or repositioning duct sections. Avoid sharp bends that exceed the manufacturer-recommended bend radius, as kinking restricts airflow and reduces system efficiency. Secure all connections with approved mechanical fasteners and mastic or listed duct tape per UL 181B requirements.

Technical Specifications

• Duct Diameter: 12 inches
• Duct Length: 25 feet
• Insulation R-Value: R-6
• Outer Jacket: Tri-directional fiberglass scrim reinforced metallized polyester
• Inner Core: Air-tight, low-to-medium pressure rated
• UL Listing: UL 181 Class 1 Air Duct
• Package Length: 27 inches
• Package Width: 16 inches
• Package Height: 16 inches
• Weight: 21.48 pounds

Standard Information

• Brand: ATCO RUBBER PRODUCTS
• Manufacturer Part Number: FD-12X25-R6FB