Southwark Metal 21_20X8 Trunk Duct End Cap 20x8

Product Description

The SOUTHWARK METAL 21_20X8 is a sheet metal trunk duct end cap sized at 20 inches by 8 inches, fabricated from hot dip galvanized steel. It is designed to seal the open end of a rectangular trunk duct section, preventing conditioned air from escaping at duct terminations. The galvanized steel construction resists corrosion in both supply and return air applications. This fitting is a standard component in forced-air HVAC distribution systems and is installed by sheet metal mechanics, HVAC technicians, and mechanical contractors working on residential and light commercial ductwork.

This end cap is suited for rectangular trunk duct systems where a clean, secure termination is required. It fits 20 inch by 8 inch trunk duct openings and is appropriate for new construction duct fabrication as well as duct modification or repair work. The trunk-type designation indicates compatibility with main supply or return air trunk runs, not branch takeoffs. ACCA and SMACNA standards govern the fabrication and installation context for this fitting.

Key Features

• Hot dip galvanized steel construction provides corrosion resistance for long service life
• Sized at 20 inches by 8 inches to match standard trunk duct openings
• Trunk-type fitting designed to seal main duct run terminations
• Fabricated to ACCA and SMACNA applicable standards
• Prevents conditioned air loss at duct end terminations

Compatibility

Designed as an OEM-style sheet metal fitting for 20 inch by 8 inch rectangular trunk duct systems installed in accordance with ACCA and SMACNA guidelines.

Installation Notes

Installation is typically performed by a licensed sheet metal mechanic or HVAC technician. Shut down the air handling system and de-energize the equipment before fitting or fastening any duct components. Secure the end cap using sheet metal screws and seal all joints with listed duct sealant or mastic per SMACNA installation standards. Follow applicable local mechanical codes for duct construction and sealing requirements.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size: 20 inches x 8 inches
• Type: Trunk
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21_20X8