Southwark Metal 20_10X8 Trunk Duct Collar 10x8 Straight

Product Description

The SOUTHWARK METAL 20_10X8 is a straight starting collar designed for sheet metal trunk duct systems in forced-air HVAC installations. Fabricated from hot dip galvanized steel, this collar provides a secure, leak-resistant transition point where branch ducts connect to the main trunk line. It is a starting collar configuration, meaning it attaches at the trunk and opens the airflow path into a branch run. HVAC sheet metal mechanics and ductwork installers use this fitting during new construction and retrofit jobs where galvanized steel duct systems are specified. The 10-inch by 8-inch dimensions make it suited for medium-capacity residential and light commercial trunk-and-branch duct layouts.

This collar is used in trunk-and-branch forced-air duct systems, typically installed in residential and light commercial applications. It fits into the main rectangular trunk duct and serves as the starting point for a branch run. Installers encounter this fitting in attic, crawlspace, and basement duct runs where the trunk transitions to a branch supply takeoff. No specific compatible model numbers or system families were provided in the product data, but the fitting is appropriate for standard rectangular sheet metal trunk duct assemblies built to ACCA and SMACNA standards.

Key Features

• Hot dip galvanized steel construction resists corrosion in unconditioned spaces
• Straight body pattern for direct, in-line trunk-to-branch connection
• Starting collar design seats flush against the trunk duct face
• Sized at 10 inches by 8 inches for medium-capacity branch runs
• Meets ACCA and SMACNA applicable standards for sheet metal ductwork

Compatibility

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

Installation Notes

Sheet metal mechanics should shut down the air handling unit and confirm the system is de-energized before cutting into an existing trunk duct. Standard sheet metal hand tools, aviation snips, and drive cleats or screws are typically used to secure the collar to the trunk. All duct connections should be sealed with listed duct sealant or mastic per local mechanical code and SMACNA installation guidelines. Duct systems in conditioned or return-air plenums may require additional fire and smoke damper compliance review per the applicable mechanical code.

Technical Specifications

• Size: 10 inches x 8 inches
• Body Pattern: Straight
• Type: Starting
• Material: Hot Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 20_10X8