Mueller Streamline 6KMR6 Flex Duct 6in R-6 Foil 25ft

Product Description

The MUELLER STREAMLINE 6KMR6 is a flexible HVAC duct designed for branch runs and takeoff connections in forced-air distribution systems. It features a foil jacket with R-6 insulation, which limits heat gain and loss along the duct run and improves system efficiency. The 6-inch diameter core moves conditioned air from trunk lines or plenums to individual supply registers. HVAC technicians and sheet metal contractors install this product during new construction and retrofit projects where rigid ductwork is impractical or where routing around obstructions is required.

This flexible duct is suited for residential and light commercial forced-air systems. It performs well in attic, crawlspace, and floor-cavity installations where temperature differentials make insulated duct necessary. The R-6 insulation rating makes it appropriate for unconditioned spaces where standard R-4 duct would fall short of energy code requirements in many jurisdictions. The 25-foot length covers typical branch run distances without requiring splices in most residential layouts.

Key Features

• R-6 insulation rating reduces conductive heat transfer in unconditioned spaces
• Foil jacket resists moisture and provides a vapor retarder layer
• 6-inch diameter suits standard branch and takeoff connections in residential systems
• Flexible construction allows routing around framing, joists, and obstructions
• 25-foot continuous length minimizes field splices on longer branch runs

Compatibility

Designed as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air supply systems using 6-inch round duct connections.

Installation Notes

Licensed HVAC technicians and sheet metal contractors typically install flexible duct under mechanical permits governed by the International Mechanical Code and applicable local energy codes. Power down the air handler and close the system dampers before making duct connections. Secure each end with an approved draw band and sheet metal screws, then seal with listed duct mastic or UL 181B-rated tape. Avoid sharp bends, compression, or sagging, as these conditions restrict airflow and reduce effective R-value.