Southwark Metal 23_22X8 Trunk Duct Collar 22x8 Inch

Product Description

The SOUTHWARK METAL 23_22X8 is a sheet metal trunk duct collar takeoff designed for rectangular duct systems in forced-air HVAC installations. Fabricated from hot dip galvanized steel, this offset starting collar provides a secure, airtight transition point where a branch duct or register boot connects to the main trunk duct. With a body dimension of 22 inches by 8 inches, it fits standard residential and light commercial trunk duct configurations. HVAC sheet metal mechanics and duct installers use this fitting to begin lateral duct runs off the main supply trunk. The offset design accommodates tight plenum spaces and finished ceiling applications where a straight takeoff would not clear structural or architectural obstructions.

This collar is suited for residential and light commercial forced-air supply duct systems built to ACCA and SMACNA standards. It serves as the starting point for a rectangular duct branch coming off a trunk line, typically installed in attic, basement, crawlspace, or mechanical room ductwork layouts. The 22 by 8 inch size is a common trunk duct dimension in single-family and multifamily residential systems. Sheet metal duct fabricators and HVAC installers use this fitting during new construction and retrofit duct work where a starting collar is required at the trunk connection.

Key Features

• Hot dip galvanized steel construction resists corrosion in unconditioned spaces
• Offset body pattern accommodates space-constrained trunk locations
• Starting collar design establishes the branch takeoff point on the main rectangular trunk
• 22 inch by 8 inch size matches standard residential trunk duct dimensions
• Fabricated to ACCA and SMACNA applicable standards for duct system integrity

Compatibility

Designed as an OEM-style replacement and new-installation fitting for rectangular sheet metal trunk duct systems built to ACCA and SMACNA standards.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal mechanic. Shut down the air handling unit and confirm the system is de-energized before cutting into an existing trunk duct. Secure the collar with sheet metal screws and seal all joints with UL 181-rated mastic or metal-backed tape per SMACNA duct construction standards. Avoid installing the collar in a way that restricts airflow or places stress on adjacent duct sections.

Technical Specifications

• Size: 22 inches x 8 inches
• Material: Hot Dip Galvanized Steel
• Body Pattern: Offset
• Type: Starting, Rectangular
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 23_22X8