Southwark Metal 78655 Wye Branch 6x5x5 in Duct Fitting

Product Description

The SOUTHWARK METAL 78655 is a sheet metal wye branch fitting used in residential and light commercial forced-air duct systems. It splits a single duct run equally into two branches, maintaining consistent airflow and air velocity across both outlets. The fitting measures 6 inches on the trunk inlet and 5 inches on each branch outlet, making it a common choice when balanced distribution is required at a duct junction. HVAC installers use this fitting during new construction trunk-and-branch layout and during retrofit work where a single run must serve two zones or registers.

This wye branch is suited for supply-air duct systems in residential and light commercial applications. The equal 5-inch outlet sizing supports balanced static pressure distribution across both branch legs. It is used in standard round or oval sheet metal duct systems and is installed at duct junctions where flow must divide without sharp transitions that would create turbulence or pressure drop.

Key Features

• Equal-split design with two 5-inch outlets off a 6-inch trunk for balanced airflow distribution
• Sheet metal construction provides durability and compatibility with standard duct sealing and taping methods
• Wye geometry reduces turbulence compared to sharp tee-style splits
• Sold individually, one fitting per unit

Compatibility

Comparable to Southwark Metal item 78666 and Snappy item 720-666. Designed as an OEM-style replacement or equivalent fitting for standard 6 x 5 x 5 inch sheet metal duct wye branch applications.

Installation Notes

Installation is performed by a licensed HVAC technician or qualified sheet metal worker. Power down the air handler or furnace at the disconnect before beginning ductwork modifications. Seal all joints with UL 181-rated mastic or foil tape per local mechanical code requirements. Do not rely on the fitting alone to balance airflow across branches without verifying system static pressure and register flow after installation.

Technical Specifications

• Trunk Inlet Diameter: 6 inches
• Branch Outlet Diameter (each): 5 inches
• Configuration: Equal wye, two-way split
• Unit of Measure: Each

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 78655