Mm Manufacturing 601-14X8X9 Register Box Snap-rail Flange

Product Description

The MM Manufacturing 601-14X8X9 is a 601 series register box with a snap-rail flange, designed for residential and light commercial forced-air HVAC systems. The box connects to round duct and accepts a standard wall or floor register at the face opening. At 14 inches by 8 inches by 9 inches nominal, this unit weighs 2.05 pounds and ships as a single assembly. HVAC installers use it to terminate a round duct run at a register location, providing a secure, square face for register mounting and a sealed duct-to-box transition.

This register box is suited for new construction and retrofit duct installations in residential homes and light commercial spaces. The snap-rail flange design speeds up register installation by allowing the register face to lock into place without exposed fasteners. The 601-14X8X9 is intended for connection to round duct in the 4-inch through 9-inch diameter range, making it a versatile fit for common residential supply air branch runs. Sheet metal contractors and HVAC installers typically specify this box when terminating flexible or rigid round duct at a wall, floor, or ceiling register opening.

Key Features

• Snap-rail flange allows fast, tool-light register face installation
• Compatible with round duct from 4 inches through 9 inches in diameter
• 601 series design available in 9 nominal sizes for layout flexibility
• Nominal face opening of 14 inches by 8 inches accepts standard register grilles
• Lightweight construction at 2.05 pounds for overhead and wall applications

Compatibility

Designed for connection to round duct from 4 inches through 9 inches in diameter. The snap-rail flange face accepts standard 14-inch by 8-inch register grilles in residential and light commercial forced-air supply systems.

Installation Notes

Installation is typically performed by licensed HVAC technicians or sheet metal contractors. Power down the air handling unit and confirm the system is de-energized before cutting into or modifying ductwork. Secure the round duct to the collar of the register box with sheet metal screws and foil-backed tape or mastic sealant per local mechanical code requirements. Confirm the framed rough opening matches the box dimensions before fastening to prevent air bypass around the flange.