Mm Manufacturing 641R6-14X8X9 Insulated Register Box

Product Description

The MM MANUFACTURING 641R6-14X8X9 is an insulated sheet metal register box designed for residential and light commercial HVAC duct systems. The box is lined with 1.5 inches of ductliner insulation, delivering an R-6 thermal rating to reduce heat gain and condensation in unconditioned spaces. A snap-rail flange is integrated into the design for fast, secure register attachment without additional hardware. HVAC installers and sheet metal contractors use this box as a boot-to-register transition at supply air openings in floors, walls, and ceilings.

This register box is suited for supply air terminations in residential forced-air systems and light commercial applications where insulated ductwork is required. The snap-rail flange allows standard T-bar or snap-in registers to seat firmly, eliminating the need for screws at the face opening. The R-6 insulation value meets common energy code requirements for supply boots located in unconditioned cavities such as floor joists and wall stud bays.

Key Features

• 1.5-inch ductliner insulation provides R-6 thermal performance
• Snap-rail flange secures standard registers without face fasteners
• 14 x 8 x 9 inch nominal opening accommodates common supply duct sizes
• Insulated construction reduces condensation risk in unconditioned spaces
• Package dimensions: 16 inches long x 10 inches wide x 6.75 inches tall

Compatibility

Designed as an OEM-style replacement or new-installation supply register box compatible with standard snap-in and T-bar registers sized for a 14 x 8 inch face opening in residential and light commercial forced-air duct systems.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal contractors. Power down the air handler or furnace at the disconnect before any duct work is modified. Seal all duct connections with listed duct mastic or UL 181-rated tape per local mechanical code requirements. Verify that the register face selected for use with this box is rated for the snap-rail flange configuration before finalizing the installation.

Technical Specifications

• Nominal Opening Size: 14 x 8 x 9 inches
• Insulation Thickness: 1.5 inches ductliner
• Insulation R-Value: R-6
• Flange Type: Snap-rail
• Package Length: 16 inches
• Package Width: 10 inches
• Package Height: 6.75 inches
• Weight: 2.5 pounds

Standard Information

• Brand: MM MANUFACTURING
• Manufacturer Part Number: 641R6-14X8X9