Southwark Metal 20_30X8 Trunk Duct Starting Collar 30x8

Product Description

The SOUTHWARK METAL 20_30X8 is a straight-body sheet metal trunk duct starting collar designed for use in forced-air HVAC duct systems. Fabricated from hot dip galvanized steel, this collar provides a durable, corrosion-resistant connection point where a branch or trunk duct originates from the main air handler or plenum. The straight body pattern allows for a clean, direct takeoff without angular offset. At 30 inches by 8 inches, this piece is sized for larger residential or light commercial trunk duct configurations and is installed by sheet metal workers and HVAC technicians during new construction or system retrofit work.

This starting collar is intended for trunk duct applications in forced-air heating and cooling systems where a main duct run begins at the air handling unit or furnace plenum. The 30-inch by 8-inch sizing suits medium-to-large duct layouts common in residential construction and light commercial builds. It is fabricated to ACCA and SMACNA standards, making it appropriate for installations governed by those design and fabrication guidelines. Sheet metal contractors use this collar as a transition fitting at the start of a rectangular trunk run.

Key Features

• Hot dip galvanized steel construction for corrosion resistance in conditioned air environments
• Straight body pattern for direct, no-offset trunk duct origination
• 30 inches by 8 inches sizing suited to larger trunk duct systems
• Fabricated to ACCA and SMACNA applicable standards
• Starting collar type for use at the air handler or plenum connection point

Compatibility

Designed as an OEM-style sheet metal starting collar 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 qualified sheet metal worker or licensed HVAC technician. The air handling unit or furnace must be powered down and the system de-pressurized before fitting this collar to the plenum or trunk. Secure connections with appropriate fasteners and seal all seams with listed duct sealant or mastic per SMACNA installation guidelines. Follow local mechanical code requirements for duct support and clearance.

Technical Specifications

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

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 20_30X8