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The SOUTHWARK METAL 1210 18X12 is a sheet metal end cap sized at 18 x 12 inches, used to close off the open end of a rectangular HVAC duct section. End caps terminate duct runs where airflow is not required, preventing air bypass and maintaining system static pressure. This fitting is a standard component in forced-air heating and cooling systems and is installed by licensed HVAC technicians and sheet metal contractors during new construction and retrofit ductwork projects.
This end cap is suited for residential and light commercial rectangular duct systems. It fits the terminal end of an 18 x 12 inch rectangular duct trunk or branch, sealing the opening to prevent conditioned air loss. Installers typically secure and seal the cap with sheet metal screws and mastic or foil tape per applicable mechanical code requirements.
Designed as an OEM-style replacement and standard fitting for 18 x 12 inch rectangular sheet metal duct systems in residential and light commercial forced-air HVAC applications.
Installation is performed by licensed HVAC technicians or sheet metal contractors. Power down the air handling equipment before working on any duct section. Fasten the end cap securely with sheet metal screws and seal all edges with mastic sealant or UL 181-listed foil tape to meet energy code and mechanical code requirements. Do not leave duct terminations unsealed, as air leakage will reduce system efficiency and pressure balance.
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