Southwark Metal 21_16X8 Trunk Duct End Cap 16x8 in

Product Description

The SOUTHWARK METAL 21_16X8 is a sheet metal trunk duct end cap designed to close off the open end of a rectangular trunk duct in forced-air HVAC distribution systems. Measuring 16 inches by 8 inches, it is fabricated from hot dip galvanized steel for corrosion resistance in both residential and light commercial ductwork applications. The end cap terminates airflow at the far end of a trunk run, preventing air bypass and maintaining static pressure balance across the supply or return system. HVAC sheet metal mechanics and duct installers use this component during new construction and duct retrofit work.

This end cap fits rectangular trunk duct measuring 16 inches by 8 inches and is suited for forced-air supply or return trunk systems in residential and light commercial construction. It is appropriate for installations where ACCA Manual D duct design standards or SMACNA fabrication guidelines apply. The galvanized steel construction makes it compatible with standard sheet metal duct systems where moisture resistance and long service life are required.

Key Features

• Hot dip galvanized steel construction resists corrosion in conditioned and unconditioned space installations
• Sized to fit 16 inch by 8 inch rectangular trunk duct openings
• Trunk-type end cap terminates airflow and maintains system static pressure
• Fabricated to ACCA and SMACNA applicable standards
• Suitable for new construction and replacement ductwork applications

Compatibility

Designed as an OEM-style replacement and new-installation component for 16 inch by 8 inch rectangular trunk duct sections in forced-air HVAC systems built to ACCA and SMACNA standards.

Installation Notes

Installation is typically performed by licensed HVAC technicians or qualified sheet metal mechanics. Shut down the air handling unit and confirm the system is de-energized before accessing ductwork. Secure the end cap using sheet metal screws and seal all joints with UL 181-rated mastic or approved foil tape per applicable mechanical codes. Verify fitment against the trunk duct dimensions before fastening to ensure an airtight closure.

Technical Specifications

• Size: 16 inches x 8 inches
• Material: Hot Dip Galvanized Steel
• Type: Trunk
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21_16X8