Southwark Metal 20_12X8 Trunk Duct Collar 12x8 Straight

Product Description

The SOUTHWARK METAL 20_12X8 is a straight starting collar designed for sheet metal trunk duct systems in forced-air HVAC applications. Fabricated from hot dip galvanized steel, this trunk collar provides a clean, secure starting point where the main trunk duct originates from the air handler or furnace plenum. The galvanized construction resists corrosion in both conditioned and unconditioned spaces such as attics, crawlspaces, and mechanical rooms. Sheet metal contractors and HVAC installers use this fitting to maintain consistent airflow geometry at the duct origin, a critical factor in system static pressure performance and overall distribution efficiency.

This collar is intended for use in residential and light commercial forced-air duct systems where a straight starting fitting is required at the trunk duct entry point. At 12 inches by 8 inches, it suits common trunk duct sizing found in residential new construction and retrofit installations. It conforms to ACCA and SMACNA standards, making it appropriate for duct systems designed and commissioned under Manual D duct design protocols or SMACNA sheet metal construction guidelines.

Key Features

• Hot dip galvanized steel construction provides corrosion resistance in exposed or semi-exposed duct installations
• Straight body pattern delivers a clean, direct starting transition at the trunk duct origin
• 12 inch by 8 inch size fits standard trunk duct dimensions common in residential forced-air systems
• Compliant with ACCA and SMACNA applicable standards for sheet metal ductwork fabrication
• Starting collar type establishes the first fitting connection point off the air handler or plenum

Compatibility

Designed as an OEM-style sheet metal starting collar for use with straight rectangular trunk duct systems built to ACCA and SMACNA standards in residential and light commercial forced-air HVAC installations.

Installation Notes

Installation of sheet metal trunk duct collars is typically performed by licensed sheet metal contractors or HVAC technicians following SMACNA duct construction standards and local mechanical codes. Always shut down and de-energize the air handling system before fitting or sealing any duct components. Mating duct sections should be secured with sheet metal screws and sealed with UL 181-rated mastic or foil tape to meet energy code requirements. Handle cut edges with care, as galvanized sheet metal edges can cause lacerations.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size: 12 inches x 8 inches
• Body Pattern: Straight
• Type: Starting
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 20_12X8