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The SOUTHWARK METAL 212014 is a sheet metal duct end cap sized at 20 x 14 inches, designed to close off the open end of a rectangular sheet metal duct section. End caps are used to terminate duct runs where airflow is not required, preventing conditioned air from escaping at dead-end duct branches. This fitting is a standard component in low-pressure residential and light commercial HVAC duct systems and is typically installed by sheet metal workers or licensed HVAC technicians during new construction, renovation, or system modification work.
This end cap is suited for rectangular duct applications where a 20 x 14 inch termination is required. It fits into existing sheet metal duct systems built to standard dimensions and is appropriate for supply or return duct configurations where a branch or main run needs to be capped off. Typical installation scenarios include balancing airflow distribution during system commissioning or sealing unused duct openings during retrofits.
Designed as an OEM-style replacement or new-installation fitting for standard 20 x 14 inch rectangular sheet metal duct systems in residential and light commercial forced-air HVAC applications.
Installation is typically performed by a licensed HVAC technician or qualified sheet metal worker. Power down the air handling unit and verify the system is depressurized before fitting the end cap. Secure the cap using drive-and-cleat, slip, or S-lock connections as appropriate to the existing duct assembly, and seal all seams with UL 181-rated duct mastic or foil tape per local mechanical code requirements.
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