Southwark Metal 20_20X8 Trunk Duct Collar 20x8 Inches

Product Description

The SOUTHWARK METAL 20_20X8 is a straight-body sheet metal trunk duct collar designed for use as a starting collar on rectangular HVAC trunk duct systems. Fabricated from hot dip galvanized steel, this fitting delivers corrosion resistance and structural integrity in both supply and return air duct assemblies. At 20 inches by 8 inches, it provides a clean, reliable connection point where a branch run or main trunk begins at the air handling equipment. HVAC sheet metal installers and duct fabricators rely on this type of fitting to maintain system airflow geometry and ensure airtight starting points in low-pressure duct systems.

This collar is suited for residential and light commercial forced-air HVAC installations where rectangular duct construction is specified. It is used at the trunk starting point, typically off a plenum or air handler discharge, and is compatible with standard sheet metal trunk duct assemblies built to SMACNA and ACCA guidelines. The straight body pattern allows for direct in-line transitions without offset, making it straightforward to fit into new construction and retrofit duct layouts alike.

Key Features

• Hot dip galvanized steel construction provides corrosion resistance for long-term duct system performance
• Straight body pattern allows direct in-line installation without offset or transition complications
• Starting collar configuration designed for trunk duct takeoff connection points
• 20 inch by 8 inch nominal size fits standard rectangular duct dimensions
• Meets ACCA and SMACNA applicable standards for sheet metal duct fabrication

Compatibility

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

Installation Notes

Installation should be performed by a licensed sheet metal mechanic or HVAC technician familiar with SMACNA duct construction standards. Shut down the air handling system and verify the system is de-energized before beginning duct work. Secure all joints with appropriate sheet metal screws and seal with listed duct sealant or mastic per local mechanical code requirements. Do not substitute this fitting in high-pressure duct classifications beyond its rated application.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size: 20 inches x 8 inches
• Body Pattern: Straight
• Type: Starting
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 20_20X8