Mm Manufacturing 641R6-14X6X8 Insulated Register Box R-6

Product Description

The MM Manufacturing 641R6-14X6X8 is an insulated sheet metal register box designed for use in forced-air duct distribution systems. The interior is lined with 1.5 inches of ductliner material, delivering an R-6 thermal rating to limit heat loss and condensation at the register opening. The box features a snap-rail flange for secure grille or register attachment without additional fasteners. At 6.75 inches in height, it fits standard residential and light commercial floor, ceiling, and sidewall register applications. Licensed HVAC technicians and sheet metal installers work with this component during new construction and duct retrofit projects.

This register box is suited for residential and light commercial forced-air HVAC installations where insulated ductwork terminations are required. The snap-rail flange design simplifies register and grille seating, making it a practical choice for floor boot and sidewall applications. The R-6 ductliner lining helps maintain supply air temperature between the plenum and the register face, which is especially important in unconditioned spaces such as crawlspaces, attics, and exterior wall cavities.

Key Features

• Interior lined with 1.5 inches of ductliner for an R-6 thermal rating
• Snap-rail flange for tool-free grille and register attachment
• Nominal 14 x 6 x 8 inch sizing for standard register openings
• Overall dimensions: 16 inches length x 8 inches width x 6.75 inches height
• Weighs 2.25 pounds for easy single-person handling during installation

Compatibility

Designed as an OEM-style replacement and new-construction component for residential and light commercial forced-air duct systems requiring a 14 x 6 x 8 inch insulated register box termination with snap-rail flange.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal installer. Shut down the air handler and isolate the duct system before cutting or modifying any ductwork. Seal all joints with UL 181-rated mastic or foil tape per local mechanical code requirements. Do not compress or damage the interior ductliner during fitting, as this reduces the effective R-value of the assembly.

Technical Specifications

• Nominal Size: 14 x 6 x 8 inches
• Overall Length: 16 inches
• Overall Width: 8 inches
• Overall Height: 6.75 inches
• Insulation Thickness: 1.5 inches ductliner
• Thermal Rating: R-6
• Weight: 2.25 pounds
• Flange Type: Snap-rail

Standard Information

• Brand: MM Manufacturing
• Manufacturer Part Number: 641R6-14X6X8