Quietflex 12MR6 Flex Duct Sleeve R-6 12 in X 5 Ft Foil

Product Description

The QUIETFLEX 12MR6 is a foil-faced flexible duct insulation sleeve rated R-6, sized at 12 inches in diameter by 5 feet in length. Known as the Thermasleeve, it slips over existing flexible duct runs or bare metal ductwork to add or restore thermal insulation performance. The reflective foil facing serves as both a vapor barrier and a radiant barrier, reducing heat gain and loss in attic and crawlspace installations. HVAC technicians and sheet metal contractors install this sleeve during new construction, system retrofits, or duct remediation projects where duct insulation is inadequate or damaged.

The 12MR6 is suited for residential and light commercial HVAC duct systems where 12-inch diameter flexible or round duct is present. It is commonly used in attic spaces, unconditioned mechanical rooms, and vented crawlspaces where thermal losses and condensation risk are highest. The sleeve format allows faster installation compared to wrap-style duct insulation, making it a practical choice for service and replacement work on existing duct runs.

Key Features

• R-6 thermal insulation rating for effective heat loss and gain reduction
• Foil facing acts as a combined vapor retarder and radiant barrier
• Sleeve design slides over existing ductwork for faster installation than wrap insulation
• 12-inch diameter accommodates standard 12-inch round and flexible duct
• 5-foot length per piece suits single duct sections and tight-space retrofits

Compatibility

Designed as an OEM-style insulation sleeve for standard 12-inch diameter round and flexible duct used in residential and light commercial HVAC systems.

Installation Notes

Installation is typically performed by licensed HVAC technicians or sheet metal contractors. Power down the air handling system before working on duct runs. Seal all duct connections with approved mastic or metal foil tape before sliding the sleeve into position, and secure sleeve ends with foil tape to maintain the vapor barrier. Follow local mechanical codes and ACCA Manual D guidelines for duct insulation requirements in your climate zone.

Technical Specifications

• Insulation Rating: R-6
• Diameter: 12 inches
• Length: 5 feet
• Facing: Foil

Standard Information

• Brand: QUIETFLEX
• Manufacturer Part Number: 12MR6