Southwark Metal 1100168 Trunk Duct Collar 16x8 in Rectangular

Product Description

The SOUTHWARK METAL 1100168 is a rectangular starting collar designed for sheet metal trunk duct systems in forced-air HVAC installations. Fabricated from hot-dip galvanized steel, this straight-pattern collar provides a clean, secure transition point where branch or trunk ductwork originates from a plenum or main supply duct. The 16-inch by 8-inch opening matches standard rectangular duct sizing used in residential and light commercial air distribution layouts. Hot-dip galvanization gives the steel corrosion resistance suited for attic, crawlspace, and basement duct runs. HVAC sheet metal installers and HVAC technicians are the primary trades that specify and install this component.

This collar is used in supply-air trunk duct systems where a starting point off a central plenum or air handler cabinet is required. The straight body pattern simplifies alignment during trunk fabrication and field layout. It fits into standard rectangular duct construction workflows following SMACNA and ACCA guidelines for residential and light commercial forced-air systems. Installations typically occur in new construction framing stages or during duct system replacement projects.

Key Features

• Hot-dip galvanized steel construction for corrosion resistance in conditioned and unconditioned spaces
• Straight body pattern for straightforward trunk alignment and layout
• Rectangular starting collar design integrates directly into plenum or main trunk connections
• 16-inch by 8-inch opening matches common rectangular duct sizing
• Compliant with ACCA, SMACNA, and NATE applicable standards

Compatibility

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

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal workers following SMACNA duct construction standards. Power down the air handling unit and close the fuel supply or disconnect electrical service before beginning any duct modification work. Secure the collar to the plenum or trunk using sheet metal screws and seal all joints with UL-listed duct sealant or mastic per local mechanical code requirements. Do not leave unsealed gaps at the collar connection point, as air leakage reduces system efficiency and can cause pressure imbalance.

Technical Specifications

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

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 1100168