Mm Manufacturing 641R6-12X6X7 Insulated Register Box R-6

Product Description

The MM Manufacturing 641R6-12X6X7 is an insulated sheet metal register box designed for residential and light commercial forced-air duct systems. It features 1.5 inches of ductliner insulation rated at R-6, providing thermal and acoustic performance at the supply register connection. The snap-rail flange simplifies grille and register attachment without separate fasteners. Licensed HVAC technicians use this box during new construction or retrofit duct rough-in work to terminate branch runouts at ceiling, wall, or floor register openings. The unit ships ready to install and integrates directly into standard low-pressure supply duct systems.

This register box is suited for residential new construction and remodel HVAC applications where insulated register boxes are required by energy codes or design specifications. It is sized for a 12 x 6 inch register opening and is compatible with trunk-and-branch supply duct layouts. The snap-rail flange design accommodates standard 12 x 6 inch grilles and registers. Installers working in climate zones that require insulated boots will find the R-6 lining meets common minimum insulation requirements for supply-side ductwork in conditioned or semi-conditioned spaces.

Key Features

• 1.5-inch ductliner insulation provides an R-6 thermal rating
• Snap-rail flange allows fast, tool-light grille and register attachment
• 12 x 6 inch register opening fits standard residential supply grilles
• Sheet metal construction for durable, code-compliant duct termination
• Insulated lining reduces condensation risk and radiant heat loss at the boot

Compatibility

Designed as an OEM-style insulated register box for standard 12 x 6 inch residential and light commercial forced-air supply duct systems. Accepts standard 12 x 6 inch grilles and registers with snap-rail mounting.

Installation Notes

Installation is typically performed by a licensed HVAC technician during duct rough-in or remodel work. Shut down the air handler and secure the system before connecting ductwork. Seal all duct connections with listed mastic or UL 181-rated tape per local mechanical code requirements. Do not compress or puncture the ductliner insulation during installation, as this reduces the effective R-value.

Technical Specifications

• Register Opening Size: 12 x 6 inches
• Insulation Thickness: 1.5 inches ductliner
• Insulation R-Value: R-6
• Overall Length: 14 inches
• Overall Width: 8 inches
• Overall Height: 6.75 inches
• Weight: 2 pounds
• Flange Type: Snap-rail

Standard Information

• Brand: MM Manufacturing
• Manufacturer Part Number: 641R6-12X6X7