Southwark Metal 23_30X8 Trunk Duct Collar 30x8 Offset

Product Description

The SOUTHWARK METAL 23_30X8 is a sheet metal trunk duct collar takeoff designed for rectangular duct systems in residential and light commercial HVAC installations. Fabricated from hot dip galvanized steel, this offset starting collar provides a durable, corrosion-resistant connection point where a trunk duct originates from an air handler, furnace plenum, or distribution box. The offset body pattern allows for clearance adjustments during layout, making it a practical choice when straight-line alignment is not possible. At 30 inches in length by 8 inches in width, it suits medium-capacity trunk runs. HVAC sheet metal mechanics and duct installers work with this fitting during the rough-in phase of forced-air system installation.

This collar takeoff is used in forced-air ducted HVAC systems where rectangular trunk duct connects to a supply or return air plenum. The offset configuration is common in residential new construction and retrofit projects where framing, joists, or mechanical obstructions require a non-centered duct departure. It is installed by licensed sheet metal workers or HVAC technicians following SMACNA and ACCA duct construction standards. The 30 x 8 inch size fits trunk duct runs that serve zone branches or primary distribution paths in single-family and small commercial applications.

Key Features

• Hot dip galvanized steel construction for corrosion resistance in conditioned and unconditioned spaces
• Offset body pattern accommodates framing obstructions and non-centered duct departures
• Starting collar configuration for trunk duct origination points at plenums or air handlers
• Rectangular profile at 30 inches x 8 inches fits standard trunk duct sizing
• Manufactured to SMACNA and ACCA applicable standards for duct fabrication

Compatibility

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

Installation Notes

Installation is performed by licensed sheet metal workers or HVAC technicians. The air handling unit or furnace should be powered down and the system depressurized before fitting any duct collar. Secure the collar to the plenum and trunk duct using sheet metal screws and approved duct sealant or mastic per SMACNA installation guidelines. Follow local mechanical codes and ACCA Manual D duct design requirements for proper sizing and sealing.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size: 30 inches Length x 8 inches Width
• Body Pattern: Offset
• Type: Starting, Rectangular
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 23_30X8