Southwark Metal 21_20X10 Trunk Duct End Cap 20x10

Product Description

The SOUTHWARK METAL 21_20X10 is a sheet metal trunk duct end cap sized at 20 inches by 10 inches, fabricated from hot dip galvanized steel. It is used to close off the open end of a rectangular trunk duct run, preventing air bypass and maintaining system static pressure. The galvanized steel construction resists corrosion in attic, crawlspace, and mechanical room environments. This fitting is installed by HVAC technicians and sheet metal workers during new construction ductwork installation or system modification.

This end cap is designed for rectangular trunk duct systems in residential and light commercial HVAC applications. It fits standard 20-inch by 10-inch trunk duct openings and is appropriate for supply or return air duct terminations. Typical install scenarios include sealing the downstream end of a trunk run after the last branch takeoff, ensuring the designed airflow is delivered to the branch ducts rather than lost at the terminus.

Key Features

• Hot dip galvanized steel construction for corrosion resistance in varied installation environments
• Sized for standard 20-inch by 10-inch rectangular trunk duct openings
• Trunk-type end cap profile for flush, secure duct termination
• Manufactured to ACCA and SMACNA applicable standards

Compatibility

Designed as an OEM-style sheet metal fitting for standard rectangular trunk duct systems conforming to SMACNA duct construction guidelines.

Installation Notes

Installation is performed by licensed HVAC technicians or sheet metal workers. Shut down the air handling unit and verify the system is de-energized before accessing ductwork. Secure the end cap to the duct opening using sheet metal screws and seal all joints with UL 181-listed mastic or foil tape per SMACNA standards to prevent air leakage. Follow local mechanical codes for duct sealing requirements.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size: 20 inches x 10 inches
• Type: Trunk End Cap
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21_20X10