Mm Manufacturing 641R6-12X8X8 Insulated Register Box 12x8x8

Product Description

The MM Manufacturing 641R6-12X8X8 is an insulated sheet metal register box designed for residential and light commercial forced-air duct systems. It features a 1.5-inch ductliner interior that delivers an R-6 thermal rating, reducing heat loss and condensation at the register opening. The box includes a snap-rail flange for fast, secure grille or register attachment without separate fasteners. Licensed HVAC technicians and sheet metal contractors install this component as part of a supply-air trunk-and-branch or plenum-style distribution system.

This register box is suited for new construction and retrofit installations where insulated supply-air terminations are required at floor, wall, or ceiling register locations. The 12 x 8 inch boot opening accommodates standard 12 x 8 inch registers and grilles. The snap-rail flange simplifies grille seating and reduces installation time on production builds or multi-unit service calls.

Key Features

• 1.5-inch ductliner interior provides R-6 thermal insulation rating
• Snap-rail flange secures grilles and registers without additional hardware
• 12 x 8 inch register opening fits standard residential supply registers
• Insulated construction reduces condensation risk at the boot termination
• Designed for use in forced-air supply distribution systems

Compatibility

Designed as an OEM-style insulated register box for use with standard 12 x 8 inch supply-air grilles and registers in residential and light commercial forced-air HVAC duct systems.

Installation Notes

Installation is performed by licensed HVAC technicians or sheet metal contractors. Power down the air handler or furnace and close the system isolation points before connecting ductwork. Seal all seams with UL-listed duct sealant or metal tape per local mechanical code requirements. Do not compress or puncture the interior ductliner during fitting, as this degrades the R-6 rating.

Technical Specifications

• Register Opening: 12 x 8 inches
• Insulation: 1.5-inch ductliner
• Insulation Rating: R-6
• Overall Length: 14 inches
• Overall Width: 10 inches
• Overall Height: 6.75 inches
• Weight: 2.3 pounds
• Flange Type: Snap-rail

Standard Information

• Brand: MM Manufacturing
• Manufacturer Part Number: 641R6-12X8X8