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The SOUTHWARK METAL 31PF-24GA_6X12 is a sheet metal duct plaster frame boot rail designed for return air applications in residential and light commercial HVAC duct systems. Fabricated from hot dip galvanized steel at 24 gauge, this plaster frame provides a rigid, corrosion-resistant border around a duct boot opening where drywall or plaster finishes meet the register face. HVAC installers and sheet metal contractors use this component to create a clean, stable transition between the duct termination and the finished wall or ceiling surface. It meets applicable ACCA and SMACNA standards for duct construction quality and dimensional consistency.
This plaster frame is sized at 6 inches by 12 inches, making it suited for standard return air boot openings in residential duct systems. It is typically installed during rough-in or finish stages of HVAC ductwork where a flush, plaster-ready border is required around the boot. Sheet metal mechanics and HVAC installation crews incorporate this frame into new construction and renovation projects where drywall or plaster finishes are applied directly up to the register opening.
Designed as an OEM-style sheet metal component for return air duct boot openings in residential and light commercial HVAC duct systems built to ACCA and SMACNA standards.
Installation is performed by licensed sheet metal mechanics or HVAC technicians following SMACNA duct construction guidelines. Power down the air handler and close any associated dampers before working inside the duct system. Secure the frame to the boot and surrounding framing using appropriate sheet metal fasteners, and verify the frame sits flush before applying drywall or plaster finish. Cut edges may be sharp — use appropriate hand protection during handling and installation.
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