Southwark Metal 21_26X8 Trunk Duct End Cap 26x8

Product Description

The SOUTHWARK METAL 21_26X8 is a sheet metal trunk duct end cap designed to close off the open end of a rectangular trunk duct in forced-air HVAC distribution systems. Fabricated from hot dip galvanized steel, this cap provides a durable, corrosion-resistant seal at the terminus of a trunk run measuring 26 inches by 8 inches. HVAC sheet metal contractors and mechanical installers use this component to cap unused or terminal duct ends, preventing air bypass and maintaining system static pressure balance across the distribution network.

This trunk end cap is used in residential and light commercial forced-air systems where rectangular sheet metal ductwork is installed. It fits a standard 26-inch by 8-inch trunk duct opening and is appropriate for new construction duct fabrication as well as duct modification and retrofit work. Installation typically occurs during rough-in or when a duct run is extended, capped, or reconfigured to adjust airflow distribution.

Key Features

• Hot dip galvanized steel construction resists corrosion in attic, crawlspace, and mechanical room environments
• Sized for 26-inch by 8-inch rectangular trunk duct openings
• Trunk-type end cap design provides a flush, airtight closure on open duct terminations
• Fabricated to ACCA and SMACNA applicable standards for sheet metal ductwork
• Reduces air bypass and helps maintain designed system static pressure

Compatibility

Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems with a 26-inch by 8-inch cross-section, consistent with SMACNA and ACCA duct construction standards.

Installation Notes

Installation is performed by licensed HVAC contractors or qualified sheet metal mechanics following SMACNA duct construction guidelines. Power down the air handling unit before working on the duct system. Secure the end cap using drive cleats or sheet metal screws as appropriate for the duct gauge and application, then seal all joints with UL 181-listed mastic or metal-backed tape per local mechanical code requirements. Do not leave duct ends unsealed during system operation.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Duct Size: 26 inches x 8 inches
• Type: Trunk End Cap
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21_26X8