Atco Rubber Products FD-5X25-R8FB Flex Duct R-8 5in X 25ft

Product Description

The ATCO RUBBER PRODUCTS FD-5X25-R8FB is a 5-inch diameter, 25-foot flexible air duct with R-8 insulation, built for low-to-medium operating pressures in residential and light commercial HVAC systems. The inner core is air-tight and constructed for reliable airflow with minimal leakage. The outer jacket is a tri-directional fiberglass scrim reinforced, metallized polyester layer that delivers both durability and thermal performance. At R-8, this duct provides strong insulation value suited for unconditioned spaces such as attics and crawlspaces where heat gain and loss are a concern. Licensed HVAC technicians and sheet metal contractors are the primary installers of this product.

This flexible duct is intended for use in residential and light commercial forced-air HVAC distribution systems. It is suited for supply and return air runs connecting trunk lines or plenums to grilles, registers, and diffusers. The R-8 insulation rating makes it a common choice in climate zones requiring higher duct insulation levels per energy codes. It is packaged in a bag format for clean jobsite handling and storage.

Key Features

• R-8 insulation rating for high-performance thermal resistance in unconditioned spaces
• Air-tight inner core designed for low-to-medium operating pressure HVAC systems
• Tri-directional fiberglass scrim reinforced, metallized polyester outer jacket
• UL 181 Class 1 Air Duct listed for code-compliant installations
• 5-inch diameter x 25-foot length in a single bag for easy handling

Compatibility

Designed as an OEM-style flexible duct replacement or new-installation component for residential and light commercial forced-air HVAC distribution systems operating at low-to-medium static pressures.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with SMACNA guidelines and applicable local mechanical codes. Power down the air handler and shut off the system before disconnecting or connecting duct runs. Flexible duct should be fully extended without sharp bends or compression, as either condition restricts airflow and reduces system efficiency. Secure connections at both ends with approved sheet metal screws and UL 181B-listed mastic or tape.

Technical Specifications

• Diameter: 5 inches
• Length: 25 feet
• Insulation Rating: R-8
• Listing: UL 181, Class 1 Air Duct
• Outer Jacket: Tri-directional fiberglass scrim reinforced metallized polyester
• Operating Pressure: Low-to-medium
• Package Weight: 13.08 pounds
• Package Length: 29 inches
• Package Width: 10 inches
• Package Height: 10 inches

Standard Information

• Brand: ATCO RUBBER PRODUCTS
• Manufacturer Part Number: FD-5X25-R8FB