Mueller Streamline 14KMR6 Flex Duct 14 in R-6 Foil 25 Ft

Product Description

The MUELLER STREAMLINE 14KMR6 is a 14-inch diameter flexible HVAC duct with R-6 insulation and a foil outer jacket, supplied in a 25-foot length. It is designed for larger airflow applications where thermal control and duct efficiency are critical. The R-6 insulation rating delivers improved resistance to heat gain and loss compared to standard R-4 flex duct, making it suitable for runs through unconditioned spaces such as attics and crawlspaces. Licensed HVAC technicians and sheet metal contractors are the primary installers of this product.

This flex duct is suited for both commercial and larger residential supply and return air distribution systems. The 14-inch diameter handles high-volume airflow demands found in commercial rooftop unit applications, large air handlers, and main trunk-to-branch transition zones. The foil jacket provides a durable outer layer that resists tears and punctures during installation. It is commonly used in new construction and retrofit duct system projects where code requires a minimum R-6 insulation value on supply ducts in unconditioned spaces.

Key Features

• 14-inch diameter supports high-volume airflow in commercial and large residential systems
• R-6 insulation rating reduces heat gain and loss in unconditioned spaces
• Foil outer jacket provides puncture resistance and a vapor retarder surface
• 25-foot length reduces the number of joints needed on longer duct runs
• Flexible construction allows routing around obstructions without rigid fittings

Compatibility

Designed as an OEM-style replacement and new-installation flex duct for commercial and residential HVAC air distribution systems requiring a 14-inch diameter flexible duct with R-6 insulation.

Installation Notes

Installation should be performed by a licensed HVAC technician or sheet metal contractor in accordance with SMACNA Flexible Duct Performance and Installation Standards and applicable local mechanical codes. Power down and lock out the air handling unit before connecting or disconnecting duct sections. Avoid compressing or sharply bending the duct, as reduced cross-sectional area will increase static pressure and decrease airflow. Secure all connections with approved clamps and mastic or metal tape rated for flex duct applications.