Southwark Metal 35_8IN Trunk Duct Reducer 8 Inches

Product Description

The SOUTHWARK METAL 35_8IN is a sheet metal trunk duct reducer designed for use in forced-air HVAC distribution systems. This fitting transitions trunk duct runs to a smaller downstream section, allowing installers to step down duct size as airflow volume decreases along a main trunk line. Fabricated from hot-dipped galvanized steel, the 35_8IN delivers corrosion resistance suitable for both conditioned and unconditioned space installations. The 8-inch sizing fits standard residential and light commercial trunk duct configurations. Sheet metal duct fitters, HVAC installers, and mechanical contractors use this type of fitting during new construction and retrofit duct work.

This trunk duct reducer is suited for residential and light commercial forced-air systems where a main supply trunk must be stepped down in cross-section. Typical applications include attic, crawlspace, and basement trunk runs where duct sizing is reduced progressively to maintain design static pressure and airflow balance. The fitting conforms to ACCA and SMACNA standards, making it appropriate for jobs where duct fabrication and installation must meet those industry guidelines.

Key Features

• Hot-dipped galvanized steel construction resists corrosion in humid or unconditioned spaces
• 8-inch trunk duct sizing fits standard residential and light commercial duct systems
• Conforms to ACCA and SMACNA applicable standards for duct fabrication and installation
• Reducer geometry allows progressive trunk sizing to support proper airflow distribution
• Sheet metal construction compatible with drive cleats, S-cleats, and standard sheet metal fasteners

Compatibility

Designed as an OEM-style sheet metal fitting for use in standard residential and light commercial forced-air trunk duct systems requiring an 8-inch reducer transition.

Installation Notes

Installation should be performed by a qualified HVAC technician or sheet metal mechanic in accordance with SMACNA duct construction standards and local mechanical codes. Shut down the air handling unit and confirm the system is de-energized before modifying any duct section. Secure the reducer using appropriate cleats and sealant per SMACNA leakage class requirements for the system. Avoid over-deflecting the fitting flanges during assembly, as deformation can compromise the seal and airflow performance.

Technical Specifications

• Size: 8 inches
• Material: Hot-Dipped Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 35_8IN