Southwark Metal 21_14X8 Trunk Duct End Cap 14x8

Product Description

The SOUTHWARK METAL 21_14X8 is a sheet metal trunk duct end cap sized at 14 inches by 8 inches, fabricated from hot-dip galvanized steel. It is used to close off the open end of a rectangular trunk duct in forced-air HVAC distribution systems. The galvanized steel construction resists corrosion and holds up to the temperature swings and airflow pressures common in residential and light commercial ductwork. HVAC sheet metal mechanics and duct installers are the primary trades who specify and install this fitting. It meets applicable ACCA and SMACNA fabrication standards, making it suitable for code-compliant duct systems.

This end cap is designed for trunk-style rectangular duct runs where a terminal closure is needed — typically at the far end of a supply or return trunk that terminates inside a mechanical room, attic, crawlspace, or conditioned space. The 14-inch by 8-inch profile fits standard rectangular trunk duct of matching dimensions. It is commonly installed during new construction duct rough-in or during system modification when a branch is capped off or a trunk is shortened.

Key Features

• Hot-dip galvanized steel construction for corrosion resistance in humid or unconditioned spaces
• 14 inches by 8 inches nominal size fits standard rectangular trunk duct openings
• Trunk-type profile for secure, flush closure of rectangular duct ends
• Fabricated to ACCA and SMACNA applicable standards for use in code-compliant installations
• Eliminates air bypass at duct terminations, helping maintain system static pressure balance

Compatibility

Designed as an OEM-style sheet metal fitting for use with standard 14 inch by 8 inch rectangular trunk duct sections in residential and light commercial forced-air HVAC systems.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal mechanics. Power down the air handling unit and verify the system is de-energized before working inside or near the duct system. The end cap is typically fastened with sheet metal screws and sealed with UL 181-listed duct sealant or mastic per local mechanical code and SMACNA guidelines. Do not leave duct ends unsealed, as air leakage at terminations reduces system efficiency and can create pressure imbalances throughout the trunk.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size: 14 inches x 8 inches
• Type: Trunk
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21_14X8