Southwark Metal 20_16X8 Trunk Duct Starting Collar 16x8

Product Description

The SOUTHWARK METAL 20_16X8 is a straight-body sheet metal trunk duct starting collar sized at 16 inches x 8 inches. This fitting connects a trunk duct run to the supply or return plenum at the air handler or furnace, serving as the origination point for rectangular ductwork systems. Constructed from hot-dip galvanized steel, the collar resists corrosion in both conditioned and unconditioned spaces. HVAC installers and sheet metal mechanics use this component during new construction and retrofit duct installations where a code-compliant, SMACNA-conforming starting collar is required at the trunk origin.

This starting collar is suited for residential and light commercial forced-air HVAC systems using rectangular trunk duct layouts. The straight body pattern allows direct attachment to the plenum face without angular offset, making it a common choice for basement, crawlspace, and attic duct systems where the trunk runs perpendicular from the air-handling unit. No specific compatible model numbers or system families were provided in the product data.

Key Features

• Hot-dip galvanized steel construction for corrosion resistance in conditioned and unconditioned spaces
• Straight body pattern for direct, in-line plenum-to-trunk connections
• 16 inches x 8 inches nominal size fits standard rectangular trunk duct configurations
• Manufactured to ACCA and SMACNA applicable standards for code-compliant duct installations
• Starting collar type establishes the origin point of a rectangular trunk duct run

Compatibility

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

Installation Notes

Installation is performed by licensed sheet metal mechanics or HVAC technicians. Shut down and lock out the air-handling unit before cutting into or attaching to any plenum or trunk duct section. Secure the collar to the plenum face using sheet metal screws and seal all joints with UL 181-rated mastic or foil tape per SMACNA guidelines and local mechanical code requirements. Wear appropriate cut-resistant gloves when handling sheet metal edges.

Technical Specifications

• Material: Hot-Dip Galvanized Steel
• Size: 16 inches x 8 inches
• Body Pattern: Straight
• Type: Starting
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 20_16X8