Mueller Streamline 7KMR6 Flex Duct 7 in R-6 25 Ft

Product Description

The MUELLER STREAMLINE 7KMR6 is a flexible insulated HVAC air distribution duct built for mid-size supply and return branch runs. It features a foil jacket outer wrap with R-6 insulation to reduce heat gain and loss, making it well-suited for applications where energy efficiency and routing flexibility are both priorities. The 7-inch diameter accommodates solid airflow in residential and light commercial systems. Licensed HVAC technicians and sheet metal installers handle this product as part of new construction and retrofit duct systems requiring clean, reliable air distribution paths.

This flex duct is used in residential and light commercial HVAC installations where branch runs connect supply or return plenums to diffusers, registers, or grilles. The 25-foot length reduces the need for mid-run connections on longer branches. The foil jacket provides a durable outer layer appropriate for attic, crawlspace, and conditioned-space installations where maintaining insulation integrity is essential for system efficiency.

Key Features

• R-6 insulation value limits thermal transfer along branch duct runs
• Foil jacket exterior resists moisture and physical wear in typical install environments
• 7-inch diameter fits standard mid-size branch run fittings and collars
• 25-foot length reduces field splices on longer routing paths
• Flexible construction allows routing around framing, obstructions, and tight bends

Compatibility

Designed as an OEM-style replacement and new-construction flexible duct for residential and light commercial HVAC air distribution systems using 7-inch branch fittings and collars.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Power down the air handling system before connecting or disconnecting any duct sections. Secure both ends with approved clamps or draw bands and seal with listed duct mastic or UL 181B-rated tape. Avoid sharp bends that compress the inner liner, as doing so restricts airflow and reduces effective insulation performance.