Southwark Metal 20_24X8 Trunk Duct Starting Collar 24x8

Product Description

The SOUTHWARK METAL 20_24X8 is a straight sheet metal trunk duct starting collar designed for use in forced-air HVAC duct systems. Fabricated from hot dip galvanized steel, this starting collar provides a secure, airtight transition point where trunk duct sections originate from an air handler, furnace plenum, or other supply or return trunk connection. At 24 inches by 8 inches, it fits standard rectangular trunk duct openings at that dimension. HVAC installers and sheet metal mechanics rely on this type of collar to establish a clean, rigid starting point for trunk duct runs, ensuring system integrity and minimizing air leakage at the source connection.

This starting collar is suited for residential and light commercial forced-air HVAC installations where rectangular sheet metal trunk duct is used. It is appropriate for supply or return duct systems built to SMACNA and ACCA standards. Typical installation scenarios include new construction duct fabrication and replacement of existing trunk collars during system upgrades or repairs. The straight body pattern allows for a direct, inline connection without offset, making it a straightforward fit in most standard trunk duct layouts.

Key Features

• Hot dip galvanized steel construction for corrosion resistance in HVAC environments
• Straight body pattern for direct inline trunk duct connections
• 24 inch by 8 inch sizing fits standard rectangular trunk duct openings
• Starting collar type establishes the origin point of a trunk duct run
• Fabricated to SMACNA and ACCA applicable standards

Compatibility

Designed as an OEM-style sheet metal component for use in residential and light commercial forced-air HVAC duct systems using 24 inch by 8 inch rectangular trunk duct.

Installation Notes

Installation is typically performed by licensed HVAC technicians or qualified sheet metal mechanics. Shut down and de-energize the air handling equipment before beginning any duct work. Secure the collar using sheet metal screws and seal all joints with UL-listed foil tape or mastic sealant in accordance with SMACNA installation guidelines. Do not use the collar as a structural support point for the duct system.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size: 24 inches x 8 inches
• Body Pattern: Straight
• Type: Starting
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 20_24X8