Southwark Metal 23_12X8 Trunk Duct Collar 12x8 Offset

Product Description

The SOUTHWARK METAL 23_12X8 is a sheet metal trunk duct collar designed as a starting collar and takeoff fitting for HVAC ductwork systems. Constructed from hot dip galvanized steel, it delivers corrosion resistance suited to both conditioned and unconditioned space installations. The offset body pattern allows the fitting to transition from a main trunk duct while accommodating spatial constraints in tight mechanical rooms or plenum spaces. At 12 inches by 8 inches, this collar serves as a branch takeoff point where a new duct run originates from the main trunk. Licensed HVAC sheet metal contractors and duct fabricators are the primary installers of this fitting type.

This collar is used in residential and light commercial forced-air HVAC systems where a branch duct run must be initiated from a rectangular main trunk. The offset configuration is particularly useful when the branch duct cannot align directly inline with the trunk, allowing the installer to work around structural members, joists, or other mechanical obstructions. It is fabricated to standards recognized by ACCA and SMACNA, making it appropriate for duct systems designed and installed to those guidelines.

Key Features

• Hot dip galvanized steel construction provides corrosion resistance for long-term duct system performance
• Offset body pattern accommodates branch runs that cannot align directly with the trunk duct centerline
• Starting collar design establishes the origin point for a new branch duct run off the main trunk
• 12 inch x 8 inch sizing fits standard rectangular trunk duct openings of that dimension
• Fabricated to ACCA and SMACNA applicable standards

Compatibility

Designed as an OEM-style replacement and new-installation fitting for rectangular trunk duct systems built to ACCA and SMACNA standards in residential and light commercial forced-air HVAC applications.

Installation Notes

Installation should be performed by a licensed HVAC or sheet metal contractor in accordance with SMACNA duct construction standards and local mechanical codes. Shut down and lock out the air handling unit before cutting into or modifying any section of an existing trunk duct. Secure the collar to the trunk duct opening using sheet metal screws and seal all joints with UL 181-rated mastic or foil tape to prevent air leakage. Do not install this fitting in a way that creates unsupported spans beyond what SMACNA tables allow for the duct gauge in use.

Technical Specifications

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

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 23_12X8