Southwark Metal 21_20X12 Trunk Duct End Cap 20x12

Product Description

The SOUTHWARK METAL 21_20X12 is a sheet metal trunk duct end cap fabricated from hot dip galvanized steel for use in forced-air HVAC duct systems. Designed to close off the open end of a rectangular trunk duct measuring 20 inches by 12 inches, this cap prevents air bypass and maintains system static pressure. The galvanized steel construction resists corrosion in both conditioned and unconditioned spaces such as attics, crawlspaces, and mechanical rooms. It is installed by licensed HVAC technicians and sheet metal contractors during new construction and retrofit duct work.

This end cap is sized for a standard 20-inch by 12-inch rectangular trunk duct and is appropriate for residential and light commercial forced-air heating and cooling systems. It is used wherever a trunk duct run requires a sealed termination point. Applications include air handler supply and return trunk systems, rooftop unit duct distribution, and horizontal or vertical duct runs where a clean, sealed end is required. Fabricated to align with ACCA and SMACNA standards, it fits into standard sheet metal duct assemblies without modification.

Key Features

• Hot dip galvanized steel construction for corrosion resistance in varied installation environments
• Sized for 20-inch by 12-inch rectangular trunk duct openings
• Trunk-type profile for flush, sealed termination of rectangular duct runs
• Fabricated to ACCA and SMACNA applicable standards
• Suitable for residential and light commercial forced-air HVAC duct systems

Compatibility

Designed as an OEM-style sheet metal replacement component for standard 20-inch by 12-inch rectangular trunk duct systems fabricated and installed to ACCA and SMACNA guidelines.

Installation Notes

Installation is performed by licensed HVAC technicians or sheet metal contractors. The air handling system should be fully powered down and the disconnect locked out before beginning duct work. The end cap is typically secured using sheet metal screws and sealed with UL 181-rated duct sealant or mastic to prevent air leakage at the joint. Follow SMACNA duct construction standards and local mechanical codes for proper fastener spacing and sealing requirements.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Duct Size: 20 inches x 12 inches
• Type: Trunk
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21_20X12