Quietflex 6KM Flex Duct 6 Inch R-4.2 25 Foot Foil Jacket

Product Description

The QUIETFLEX 6KM is a 6-inch diameter flexible air duct designed for residential and light commercial HVAC air distribution. It ships in a 25-foot length and carries an R-4.2 insulation value, providing reliable thermal performance to limit heat gain and loss through ductwork runs. The outer jacket is foil-faced, which resists tearing and moisture infiltration. The inner core is smooth to support unrestricted airflow and reduce turbulence noise. Licensed HVAC technicians and sheet metal installers typically select this duct for both supply and return air branch runs where a flexible, insulated connection is required.

This flexible duct suits residential forced-air systems and light commercial applications where rigid ductwork is impractical or where a short, flexible branch connection is needed between a supply plenum or trunk line and a diffuser or boot. It is well suited for attic, crawlspace, and interior wall chase installations. The foil jacket handles the temperature and humidity ranges typical in conditioned and semi-conditioned spaces.

Key Features

• 6-inch diameter inner core for standard residential branch duct sizing
• 25-foot length provides a full run of flexible duct in a single piece
• R-4.2 insulation value limits thermal loss and gain along the duct run
• Foil outer jacket resists moisture and physical damage during and after installation
• Smooth inner liner promotes quiet, low-resistance airflow
• Suitable for both supply and return air applications

Compatibility

Designed as an OEM-style flexible duct replacement or new-installation component compatible with standard 6-inch HVAC fittings, boots, and collars used in residential and light commercial forced-air systems.

Installation Notes

Installation should be performed by a qualified HVAC technician in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Power down the air handler or furnace and close the disconnect before beginning duct work. Avoid sharp bends that reduce the inner diameter or create high-resistance elbows; maintain the largest practical bend radius throughout the run. Secure both ends with approved clamps or draw bands and seal all connections with UL 181B-listed mastic or tape before restoring system operation.

Technical Specifications

• Inner Diameter: 6 inches
• Length: 25 feet
• Insulation R-Value: R-4.2
• Jacket Type: Foil

Standard Information

• Brand: QUIETFLEX
• Manufacturer Part Number: 6KM