Mm Manufacturing 800-5X4X4 Sheet Metal Wye 5x4x4 Duct

Product Description

The MM Manufacturing 800-5X4X4 is a sheet metal wye fitting designed for branch splits in forced-air duct systems. It divides a single duct run into two outlets, allowing airflow to be distributed from a main trunk or branch line to two separate downstream runs. The fitting measures 5 inches on the main inlet and 4 inches on each branch outlet. At 0.97 pounds, it is lightweight enough for one-person installation in tight ceiling or wall cavities. HVAC installers and sheet metal technicians use this fitting during new construction and retrofit duct work to create balanced supply or return air branches.

This wye fitting is suited for residential and light commercial forced-air HVAC installations where a single duct run must split into two 4-inch branches. Typical applications include supply air distribution from a main trunk line, branch-off points in a radial or extended plenum duct layout, and retrofit modifications where an additional run is added to an existing system. The compact profile accommodates standard joist-bay and framed-cavity installations.

Key Features

• 5-inch main inlet splits to dual 4-inch branch outlets for balanced airflow distribution
• Sheet metal construction provides rigid, low-deflection duct connections
• Lightweight at 0.97 pounds for single-technician handling in confined spaces
• Compact overall dimensions fit within standard framed cavities and joist bays
• Compatible with standard 5-inch and 4-inch round duct collars and snap-lock pipe

Compatibility

Designed as an OEM-style sheet metal wye fitting for use with standard 5-inch main and 4-inch branch round duct connections in residential and light commercial forced-air HVAC ductwork systems.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal workers. Power down the air handling unit and verify the system is de-energized before modifying any duct section. Secure all connections with sheet metal screws and seal joints with UL 181-rated foil tape or duct mastic to meet energy code requirements. Support the fitting independently where required by local mechanical codes to prevent stress on adjoining duct connections.

Technical Specifications

• Main Inlet Size: 5 inches
• Branch Outlet Size: 4 inches (x2)
• Length: 8.5 inches
• Width: 5 inches
• Height: 12.5 inches
• Weight: 0.97 pounds

Standard Information

• Brand: MM Manufacturing
• Manufacturer Part Number: 800-5X4X4