Mm Manufacturing 641R6-10X10X8 Insulated Register Box

Product Description

The MM Manufacturing 641R6-10X10X8 is a factory-insulated sheet metal register box designed for residential and light commercial forced-air duct systems. The box features a 1.5-inch ductliner interior that delivers an R-6 thermal rating, reducing heat loss and condensation at the register opening. A 4-inch tall body with an integrated snap-rail flange allows the register grille to lock into place without separate fasteners. Licensed HVAC contractors and sheet metal installers use this box as a direct transition point between the branch duct and the floor, ceiling, or wall register.

This register box fits standard trunk-and-branch duct layouts in new construction and retrofit applications. The 10-inch by 10-inch opening matches common 10x10 register grilles and dampers. The 8-inch depth accommodates typical floor joist or ceiling cavity rough-in dimensions. The snap-rail flange simplifies grille seating during finishing, making it well suited for production homebuilding and remodel work where speed and consistency matter.

Key Features

• 1.5-inch ductliner interior provides R-6 thermal insulation at the register boot
• 4-inch tall box body with integrated snap-rail flange for tool-free grille retention
• 10-inch by 10-inch face opening matches standard 10x10 register grilles
• 8-inch depth suits common floor joist and ceiling cavity rough-in clearances
• Sheet metal construction for durable, long-term duct system performance

Compatibility

Designed as an OEM-style replacement or new-construction register boot for residential and light commercial forced-air duct systems accepting a 10-inch by 10-inch register grille with snap-rail retention.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor. Shut down the air handling system before cutting into existing ductwork or positioning the boot in the cavity. Seal all connections with UL 181-rated mastic or foil tape per local mechanical code requirements. Ensure the snap-rail flange sits flush with the finished surface before seating the register grille.

Technical Specifications

• Face Opening: 10 inches x 10 inches
• Depth: 8 inches
• Box Height: 4 inches
• Insulation Thickness: 1.5 inches ductliner
• Insulation Rating: R-6
• Overall Length: 12 inches
• Overall Width: 12 inches
• Overall Height: 6.75 inches
• Weight: 2.25 pounds

Standard Information

• Brand: MM Manufacturing
• Manufacturer Part Number: 641R6-10X10X8