Quietflex 16KMR8 Flex Duct 16 in R-8 25 Ft

Product Description

The QUIETFLEX 16KMR8 is a foil-jacketed flexible HVAC duct designed for large-capacity air distribution in commercial and residential applications where high insulation performance is required. Built with R-8 insulation and a durable foil outer jacket, this duct minimizes thermal losses across long duct runs and in unconditioned spaces such as attics and crawlspaces. The 16-inch diameter accommodates high-volume airflow, making it well suited for main trunk or large branch runs. It comes in a 25-foot length per section. Licensed HVAC technicians and sheet metal contractors are the primary installers of this product class.

This flex duct is used in commercial HVAC systems and large residential installations where efficiency ratings and insulation values must meet energy code requirements. The 16-inch diameter is common in commercial air handler distribution, large rooftop unit branch feeds, and high-CFM zoned systems. Its R-8 insulation value exceeds the R-6 minimum required by many current energy codes, making it a solid choice for projects requiring compliance with ASHRAE 90.1 or state-specific energy standards.

Key Features

• R-8 insulation value for reduced thermal loss in unconditioned spaces
• Foil outer jacket provides vapor barrier protection and durability
• 16-inch diameter supports high-volume commercial and large residential airflow
• 25-foot section length reduces the number of joints needed in long runs
• Flexible construction allows routing around structural obstructions without rigid fittings

Compatibility

Designed as an OEM-style replacement and new-installation flex duct for commercial and large residential HVAC systems requiring 16-inch diameter flexible duct with R-8 insulation.

Installation Notes

Installation should be performed by a licensed HVAC technician or sheet metal contractor in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Support hangers must be spaced to prevent excessive sagging, which increases static pressure and reduces system efficiency. Secure all connections at collars and fittings with approved clamps and UL 181-rated mastic or foil tape before insulating joints. Shut down and lock out the air handling system before making any duct connections.

Technical Specifications

• Insulation Value: R-8
• Diameter: 16 inches
• Length: 25 feet
• Jacket Type: Foil

Standard Information

• Brand: QUIETFLEX
• Manufacturer Part Number: 16KMR8