Southwark Metal 78_12X8X8 Duct Wye Branch 12x8x8 in

Product Description

The Southwark Metal 78_12X8X8 is a round sheet metal duct wye branch joint used to split a single duct run into two separate branches within a forced-air HVAC distribution system. Fabricated from hot-dipped galvanized steel, this fitting measures 12 inches on the main trunk with two 8-inch branch outlets. The wye configuration reduces turbulence at the split point compared to hard-tee fittings, supporting balanced airflow across both branch runs. Installation is handled by licensed sheet metal workers and HVAC technicians during new construction or retrofit duct work.

This wye branch is suited for residential and light commercial duct systems where a 12-inch round main feeds two 8-inch round branch ducts. Typical applications include supply-air trunk-to-branch transitions in forced-air furnace, air handler, and heat pump systems. The round profile is compatible with standard round duct collars, spin-in fittings, and flex duct connectors used throughout residential HVAC installations. The fitting meets ACCA and SMACNA standards for sheet metal ductwork fabrication and performance.

Key Features

• Hot-dipped galvanized steel construction for corrosion resistance in conditioned and unconditioned spaces
• Round wye configuration supports smoother airflow transitions compared to standard tee branch fittings
• 12-inch main inlet with dual 8-inch branch outlets for flexible duct layout planning
• Fabricated to ACCA and SMACNA applicable standards for sheet metal duct fittings
• Compatible with standard round duct systems, flex connectors, and spin-in collar installations

Compatibility

Designed as an OEM-style sheet metal fitting for round duct systems in residential and light commercial forced-air HVAC applications requiring a 12-inch main to dual 8-inch branch transition.

Installation Notes

Installation should be performed by a licensed HVAC technician or sheet metal worker in accordance with SMACNA duct construction standards and local mechanical codes. Power down the air handler or furnace at the disconnect before making any duct connections. Secure the wye branch with sheet metal screws and seal all joints with UL 181-rated mastic or foil tape to maintain system static pressure. Do not overtighten fasteners on the galvanized collar flanges, as deformation can compromise the airtight seal.

Technical Specifications

• Material: Hot-Dipped Galvanized Steel
• Type: Round
• Main Inlet Size: 12 inches
• Branch Outlet Size: 8 inches x 8 inches
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: Southwark Metal
• Manufacturer Part Number: 78_12X8X8