Southwark Metal 21_12X12 Trunk Duct End Cap 12x12

Product Description

The SOUTHWARK METAL 21_12X12 is a hot-dip galvanized steel sheet metal trunk duct end cap sized at 12 inches x 12 inches. It is used to close off the open end of a rectangular trunk duct in a forced-air HVAC distribution system. The hot-dip galvanization process provides corrosion resistance suited to both conditioned and unconditioned spaces. Sheet metal HVAC ductwork fabricators and installation technicians are the primary trades that work with this component. It is fabricated to meet ACCA and SMACNA standards, ensuring it fits within compliant duct system assemblies.

This end cap is designed for trunk-style rectangular duct runs common in residential and light commercial forced-air heating and cooling systems. It terminates the main trunk line at either end of a supply or return duct run, preventing air bypass and maintaining system static pressure. It is typically installed during initial duct fabrication or when extending or capping an existing trunk duct section.

Key Features

• Hot-dip galvanized steel construction for corrosion resistance in HVAC duct environments
• 12 inches x 12 inches size fits standard square trunk duct openings of that dimension
• Trunk-type profile closes rectangular main duct runs cleanly and securely
• Fabricated to ACCA and SMACNA applicable standards for use in compliant duct systems
• Sheet metal construction supports mechanical fastening and mastic or tape sealing per code

Compatibility

Designed as an OEM-style sheet metal fitting for use with 12 inch x 12 inch rectangular trunk duct systems fabricated and installed to ACCA and SMACNA standards.

Installation Notes

Installation is typically performed by a licensed sheet metal contractor or HVAC installer. Power down the air handling equipment before working on any duct section. The end cap should be mechanically fastened and sealed with UL 181-rated mastic or foil tape in accordance with SMACNA duct construction standards and applicable local mechanical codes. Do not leave duct ends unsealed, as air bypass will reduce system efficiency and static pressure balance.

Technical Specifications

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

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21_12X12