Southwark Metal 21_8X8 Trunk Duct End Cap 8x8 Galvanized

Product Description

The SOUTHWARK METAL 21_8X8 is a sheet metal trunk duct end cap designed to close off the open end of a rectangular trunk duct in forced-air HVAC duct systems. Fabricated from hot dip galvanized steel, this cap provides a durable, corrosion-resistant termination point for 8 x 8 inch trunk duct sections. It prevents air bypass and maintains system static pressure at the end of a supply or return trunk run. HVAC sheet metal mechanics and duct fabricators install this fitting as part of a complete duct assembly on new construction or retrofit projects.

This end cap is used on rectangular trunk duct systems in residential and light commercial forced-air applications. It fits 8 x 8 inch trunk duct openings and is appropriate for supply or return air trunk terminations where the duct run ends at a wall, floor, or attic boundary. Installation typically occurs during rough-in duct work before system startup.

Key Features

• Hot dip galvanized steel construction for corrosion resistance in attic, crawlspace, and mechanical room environments
• Sized for 8 x 8 inch trunk duct openings
• Closes off trunk duct ends to prevent air bypass and maintain system pressure balance
• Meets ACCA and SMACNA applicable standards for sheet metal duct construction
• Trunk-type fitting for rectangular duct systems

Compatibility

Designed as an OEM-style sheet metal fitting for 8 x 8 inch rectangular trunk duct systems built to ACCA and SMACNA standards in residential and light commercial forced-air HVAC applications.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal mechanics. Shut down and de-energize the air handling unit before working on the duct system. The cap is typically secured with sheet metal screws and sealed with UL 181-listed duct mastic or foil tape to meet code requirements. Follow SMACNA duct construction standards and local mechanical codes for fastener spacing and sealing requirements.

Technical Specifications

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

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21_8X8