Southwark Metal 21_30X8 Trunk Duct End Cap 30x8 in

Product Description

The SOUTHWARK METAL 21_30X8 is a hot-dip galvanized steel sheet metal trunk duct end cap sized at 30 inches by 8 inches. It closes off the terminal end of a rectangular trunk duct run, preventing conditioned air from escaping at duct terminations and maintaining system static pressure. Fabricated from hot-dip galvanized steel, it resists corrosion in typical attic, crawlspace, and mechanical room environments. HVAC installers and sheet metal mechanics install this fitting as part of a complete forced-air duct system. It conforms to ACCA and SMACNA standards for duct construction and fitment.

This end cap is used in residential and light commercial forced-air HVAC systems wherever a 30-inch by 8-inch rectangular trunk duct requires termination. Typical applications include main supply or return trunk runs that dead-end at a wall, mechanical room boundary, or equipment cabinet. It is installed during new construction duct fabrication or as a replacement fitting during duct repair and modification work.

Key Features

• Hot-dip galvanized steel construction for corrosion resistance in standard HVAC environments
• Sized at 30 inches by 8 inches to match standard rectangular trunk duct dimensions
• Trunk-type end cap that seals terminal duct openings and maintains system pressure balance
• Fabricated to ACCA and SMACNA applicable standards for sheet metal duct fittings
• Direct sheet metal fitting — no adapters required for matching trunk duct cross-sections

Compatibility

Designed as an OEM-style sheet metal fitting for use with standard 30-inch by 8-inch rectangular trunk duct systems built to ACCA and SMACNA specifications.

Installation Notes

Installation is typically performed by a licensed sheet metal mechanic or HVAC technician. Shut down the air handling system and relieve any system pressure before fitting or sealing duct components. Secure the end cap to the duct with sheet metal screws and seal all joints with UL 181-rated mastic or metal foil tape per SMACNA guidelines. Handle cut sheet metal edges with care to avoid injury during fitting.

Technical Specifications

• Material: Hot-Dip Galvanized Steel
• Size: 30 inches x 8 inches
• Type: Trunk
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21_30X8