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The SOUTHWARK METAL 28R_6X12X7 is a center-end sheet metal pipe boot designed to connect round duct to a floor or ceiling register opening in residential and light commercial HVAC distribution systems. Fabricated from hot dip galvanized steel, this register boot transitions from a 7-inch diameter round duct collar to a 6-inch by 12-inch rectangular register opening. The center-end configuration positions the round collar at the center of the boot rather than at an offset, making it suitable for straight-run trunk-and-branch duct layouts where alignment is critical. HVAC installers and sheet metal mechanics are the primary tradespeople who specify and install this fitting.
This boot is used in forced-air heating and cooling systems where branch ducts terminate at floor, wall, or ceiling registers. The 6-inch by 12-inch register face is a common standard opening size found across a wide range of residential construction applications. The center-end design accommodates installations where the supply branch drops or rises vertically into the register box without requiring an offset transition. It is compatible with standard 7-inch round flexible duct or rigid round pipe and mounts beneath or within a framed floor or ceiling cavity.
Designed as an OEM-style sheet metal fitting compatible with standard 7-inch round duct branch connections terminating at a 6-inch by 12-inch floor or ceiling register opening in residential forced-air HVAC systems.
Installation is performed by licensed HVAC technicians or sheet metal mechanics following SMACNA duct construction standards. The system blower should be powered down and the thermostat set to off before connecting or sealing any duct fittings. Secure the round collar to the branch duct with sheet metal screws and seal all joints with UL 181-rated mastic or foil tape per local mechanical code requirements. Do not overtighten fasteners on the galvanized collar, as deformation can affect the duct seal.
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