Quietflex 14KMR8 Flexible Duct 14 in R-8 Foil Jacket 25 Ft

Product Description

The QUIETFLEX 14KMR8 is a 14-inch flexible duct designed for supply and return air applications in residential and commercial HVAC systems. Built with an R-8 insulation value and a foil outer jacket, it delivers strong thermal performance while resisting moisture and tearing. The 25-foot length suits a wide range of trunk-to-register runs without splicing. The flexible inner core supports smooth, low-turbulence airflow, reducing noise during system operation. Licensed HVAC technicians install this duct during new construction, renovation, and equipment changeout work where high-efficiency air distribution is required.

This flexible duct is suited for both residential and light commercial forced-air systems. It performs well in attic, crawlspace, and mechanical room installations where thermal losses through ductwork must be controlled. The R-8 insulation rating makes it a practical choice in climate zones with strict energy code requirements for duct insulation. Supply and return air runs are both supported by this product type.

Key Features

• 14-inch inner diameter supports high-volume airflow in main distribution runs
• R-8 insulation value meets energy code requirements in most climate zones
• Foil outer jacket resists moisture and physical abrasion
• 25-foot continuous length reduces the number of joints and connection points
• Flexible inner core allows routing around structural obstructions
• Suitable for both supply and return air duct configurations

Compatibility

Designed as an OEM-style flexible duct replacement for residential and commercial forced-air HVAC systems requiring 14-inch diameter insulated duct with R-8 thermal performance.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with applicable mechanical codes including SMACNA guidelines and local energy codes. Power down the air handling unit and close the disconnect before making duct connections. Minimize sharp bends in the flexible inner core to avoid restricting airflow or creating pressure drop; support the duct at recommended intervals to prevent sagging. Seal all connections with approved mastic or metal tape rated for flexible duct applications.

Technical Specifications

• Inner Diameter: 14 inches
• Length: 25 feet
• Insulation R-Value: R-8
• Jacket Type: Foil

Standard Information

• Brand: QUIETFLEX
• Manufacturer Part Number: 14KMR8