Southwark Metal 17_16X8-12X8 Trunk Duct Transition 16x8 to 12x8

Product Description

The SOUTHWARK METAL 17_16X8-12X8 is a sheet metal trunk duct transition reducer designed for rectangular HVAC ductwork runs that require a step-down in cross-section. Fabricated from hot dip galvanized steel, this fitting tapers on one side, reducing from a 16 x 8 inch inlet to a 12 x 8 inch outlet. The single-side taper maintains consistent duct alignment on one face, which simplifies installation in tight or offset trunk runs. Sheet metal contractors and HVAC installers use this fitting to manage airflow distribution across supply trunk systems in both new construction and retrofit applications.

This transition is suited for rectangular supply or return trunk systems in residential and light commercial forced-air installations. It is used wherever trunk ductwork narrows after a branch takeoff, helping balance static pressure across the distribution system. The galvanized steel construction holds up in attic, crawlspace, and mechanical room environments. Installers working to SMACNA and ACCA duct design standards will find this fitting consistent with those guidelines for tapered trunk construction.

Key Features

• Reduces from 16 x 8 inches to 12 x 8 inches to step down trunk duct size after branch connections
• Hot dip galvanized steel construction resists corrosion in typical HVAC installation environments
• Single-side taper keeps one duct face flush, aiding alignment in confined spaces
• Fabricated to SMACNA and ACCA applicable standards for duct fittings
• Drop-in replacement for same-dimension trunk transition fittings in sheet metal duct systems

Compatibility

Designed as an OEM-style replacement or new-installation fitting for rectangular sheet metal trunk duct systems requiring a 16 x 8 inch to 12 x 8 inch reduction.

Installation Notes

Installation should be performed by a qualified sheet metal contractor or licensed HVAC technician in accordance with SMACNA duct construction standards and local mechanical codes. Power down the air handling equipment before fitting or connecting duct sections. Secure the transition with sheet metal screws and seal all joints with UL-listed duct sealant or approved mastic to prevent air leakage. Do not force the fitting against duct faces that are not aligned, as distorting the taper can compromise the seal.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Inlet Size (A): 16 x 8 inches
• Outlet Size (B): 12 x 8 inches
• Taper Type: Tapered to One Side
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 17_16X8-12X8