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The SOUTHWARK METAL mc-rb58f-6x12x7 is a 30-gauge galvanized steel center end boot designed for sheet metal duct distribution systems. This uninsulated fitting provides a 90-degree transition from rectangular duct to a floor, ceiling, or wall register collar. Hot-dipped galvanized construction resists corrosion in typical residential and light commercial HVAC installations. At 6 x 12 x 7 inches, it fits standard rectangular duct runs and is part of the 58F series of sheet metal fittings. HVAC sheet metal installers and duct fabricators use this boot during new construction and retrofit trunk-and-branch duct system builds.
This center end boot is suited for residential forced-air heating and cooling systems where a rectangular duct terminates at a register opening in the floor, ceiling, or wall. The 90-degree configuration directs airflow from the horizontal or vertical duct run into the conditioned space. The 58F series offers consistent sizing and gauge for compatibility across a range of supply-air applications in low-pressure duct systems.
Designed as an OEM-style sheet metal fitting for residential and light commercial forced-air duct systems using standard rectangular trunk-and-branch configurations.
Installation is typically performed by licensed HVAC technicians or qualified sheet metal workers. Shut down the air handler and disconnect power before modifying or connecting ductwork. Secure the boot to the duct with sheet metal screws and seal all joints with UL 181-rated mastic or foil tape per local mechanical code requirements. Do not use uninsulated boots in unconditioned spaces without applying external duct wrap to meet energy code compliance.
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