Southwark Metal 21_22X8 Trunk Duct End Cap 22x8 in

Product Description

The SOUTHWARK METAL 21_22X8 is a hot-dip galvanized steel trunk duct end cap designed to terminate rectangular sheet metal trunk ducts at 22 inches by 8 inches. It closes off the open end of a trunk duct run, preventing air bypass and maintaining system static pressure. The hot-dip galvanization process provides durable corrosion resistance suited for attic, crawlspace, and mechanical room installations. This fitting is installed by sheet metal workers and HVAC technicians as part of new construction ductwork or retrofit trunk systems built to ACCA and SMACNA standards.

This end cap is used in residential and light commercial forced-air HVAC systems where rectangular trunk duct is the primary air distribution method. It is suited for supply or return trunk terminations in standard low-pressure duct systems. The 22-inch by 8-inch profile matches common trunk duct sizes used in single-family and multi-family applications. Installers typically use this fitting at the dead-end of a trunk run where no further branch takeoffs are required.

Key Features

• Hot-dip galvanized steel construction for corrosion resistance in damp or unconditioned spaces
• 22-inch by 8-inch opening matches standard rectangular trunk duct dimensions
• Trunk-type end cap terminates duct runs and eliminates air bypass at the end of the system
• Fabricated to ACCA and SMACNA applicable standards for commercial and residential duct systems
• Sheet metal construction supports secure fastening with sheet metal screws and duct sealant

Compatibility

Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems measuring 22 inches by 8 inches, fabricated to ACCA and SMACNA ductwork standards.

Installation Notes

Installation is performed by licensed HVAC technicians or sheet metal workers following SMACNA duct construction standards. Power down the air handling unit before sealing and fastening duct fittings. Secure the end cap with sheet metal screws at the duct joint and apply mastic sealant or UL 181-rated tape to all seams to meet applicable energy code requirements. Do not leave duct terminations unsealed, as air leakage at trunk ends reduces system efficiency and static pressure.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Duct Size: 22 inches x 8 inches
• Type: Trunk End Cap
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21_22X8