Mueller Streamline 20KMR6 Flexible Duct 20 in R-6 Foil 25 Ft

Product Description

The MUELLER STREAMLINE 20KMR6 is a large-diameter flexible HVAC duct designed for commercial air distribution systems that demand high airflow capacity and effective thermal performance. Built with a foil jacket and R-6 insulation, this duct helps minimize heat gain and loss across major supply and return runs. The 20-inch diameter accommodates substantial airflow volumes, making it suitable for trunk lines and primary distribution paths where undersized ductwork would create static pressure problems. Sold in 25-foot lengths, it is installed by licensed HVAC technicians and sheet metal contractors working on commercial HVAC projects.

This flexible duct is suited for commercial HVAC installations where large-diameter runs are required in mechanical rooms, plenum spaces, and above-ceiling distribution systems. The R-6 insulation value meets energy code requirements in many jurisdictions, making it appropriate for conditioned spaces where thermal losses must be controlled. Its flexibility simplifies routing around structural obstructions compared to rigid sheet metal duct, reducing labor time on complex installations.

Key Features

• 20-inch diameter supports high-volume airflow in major supply and return trunk runs
• R-6 insulation rating reduces heat transfer and supports energy code compliance
• Foil jacket provides a durable outer layer suitable for plenum and above-ceiling environments
• 25-foot length reduces the number of joints required per run
• Flexible construction simplifies routing around beams, pipes, and other obstructions

Compatibility

Designed as an OEM-style replacement and new-installation flexible duct for commercial HVAC air distribution systems requiring a 20-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 installation standards and applicable local mechanical codes. Power down the air handling unit and lock out the system before connecting ductwork. Avoid compressing or sharp-bending the duct, as either condition significantly reduces effective airflow and insulation performance. Secure all connections with approved clamps and mastic or UL 181-listed tape rated for the application.