Mm Manufacturing 601-8X4X5 Register Box Snap-rail Flange

Product Description

The MM MANUFACTURING 601-8X4X5 is a 601 series register box with snap-rail flange, designed for connecting round duct to a wall or floor register opening in residential and light commercial HVAC distribution systems. The box measures 8 inches by 4 inches by 5 inches at the register opening and accepts round duct connections ranging from 4 inches through 9 inches in diameter depending on the size selected. The snap-rail flange provides a secure, tool-friendly method of attaching standard registers or grilles. HVAC installers and sheet metal contractors use this box as a standard transition fitting in forced-air duct systems.

The 601-8X4X5 is suited for new construction and retrofit duct installations where a round-to-rectangular transition is needed at the register location. It fits within the 601 series product family, which is available in nine standard sizes to accommodate a range of duct diameters from 4 inches through 9 inches. Typical applications include floor, wall, and ceiling register rough-in work in residential forced-air systems.

Key Features

• Snap-rail flange allows fast, secure register or grille attachment without separate fasteners
• Register opening sized at 8 inches x 4 inches x 5 inches for standard register fitment
• Compatible with round duct connections from 4 inches through 9 inches in diameter
• Part of the 601 series, available in 9 standard sizes for flexible duct layout planning
• Lightweight construction at 0.75 pounds for easy single-tech handling during install

Compatibility

Designed as an OEM-style replacement and new-construction fitting for residential and light commercial forced-air duct systems requiring a round-duct-to-register-opening transition at wall, floor, or ceiling register locations.

Installation Notes

Installation is typically performed by licensed HVAC technicians or sheet metal contractors. Power down the air handler and close the supply air damper before working in the duct system. Secure the round duct to the collar using approved duct tape or mechanical fasteners per local mechanical code requirements. Verify register or grille dimensions match the 8 inches x 4 inches x 5 inches opening before finalizing the rough-in.

Technical Specifications

• Register Opening Size: 8 inches x 4 inches x 5 inches
• Round Duct Compatibility Range: 4 inches to 9 inches diameter
• Overall Length: 6.25 inches
• Overall Width: 10.25 inches
• Overall Height: 8 inches
• Weight: 0.75 pounds

Standard Information

• Brand: MM MANUFACTURING
• Manufacturer Part Number: 601-8X4X5