Quietflex 5KPR8 Flexible Duct 5 in X 25 Ft R-8

Product Description

The QUIETFLEX 5KPR8 is a 5-inch diameter flexible duct rated R-8 and sold in 25-foot lengths. It features a UV-inhibited black outer jacket designed to resist degradation in attic and exposed-installation environments. The inner liner is supported by a wire helix that maintains airflow cross-section under bending and compression. HVAC technicians and mechanical contractors install this duct in residential and light commercial forced-air distribution systems to connect supply and return air plenums to diffusers and registers. The R-8 insulation value meets energy code requirements in many climate zones, making it a common spec for new construction and replacement work.

The 5KPR8 is suited for residential and light commercial air distribution applications where a 5-inch supply or return duct run is required. The 25-foot bag length is a standard contractor pack, reducing field cuts and waste on typical residential trunk-and-branch layouts. The UV-inhibited jacket makes it appropriate for unconditioned attic spaces, crawlspaces, and other locations where the duct may see incidental light exposure over time.

Key Features

• 5-inch inside diameter for standard residential supply and return branch runs
• 25-foot length per bag for efficient contractor use
• R-8 insulation rating meets current energy code minimums in most climate zones
• UV-inhibited black outer jacket resists degradation in attic and exposed installations
• Wire helix inner core maintains duct shape and airflow cross-section under bends

Compatibility

Designed as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC systems requiring a 5-inch insulated branch duct.

Installation Notes

Flexible duct installation is performed by licensed HVAC technicians and sheet metal mechanics. Power down the air handling unit at the disconnect before connecting or repositioning duct runs. Secure each end with approved clamps or ties and seal with listed mastic or metallic tape per SMACNA guidelines and local mechanical code requirements. Avoid sharp bends and compression of the duct body, as restrictions reduce airflow and system efficiency.

Technical Specifications

• Inside Diameter: 5 inches
• Length: 25 feet per bag
• Insulation Rating: R-8
• Outer Jacket: UV-inhibited black

Standard Information

• Brand: QUIETFLEX
• Manufacturer Part Number: 5KPR8