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The SOUTHWARK METAL 31_30X8 is a sheet metal duct register frame designed for return air applications in forced-air HVAC systems. Constructed from hot dip galvanized steel, this frame provides a durable, corrosion-resistant border for return air grille openings in residential and light commercial ductwork. The frame measures 30 inches by 8 inches and is built to ACCA and SMACNA standards, making it appropriate for professionally installed duct systems. HVAC technicians and sheet metal contractors use this type of frame to finish rough duct openings cleanly and securely seat return air grilles or registers.
This register frame is suited for return air duct terminations in wall, floor, or ceiling installations where a clean, rigid border is required. It fits 30-inch by 8-inch duct openings and is commonly used during new construction ductwork fabrication or retrofit installations when upgrading return air pathways. The galvanized steel construction holds up in unconditioned spaces such as crawlspaces, attics, and mechanical rooms where moisture exposure is possible.
Designed as an OEM-style sheet metal duct register frame for return air openings measuring 30 inches by 8 inches in residential and light commercial forced-air HVAC duct systems.
Installation is typically performed by licensed HVAC technicians or sheet metal contractors following SMACNA and ACCA ductwork guidelines. Power down the air handling equipment and verify the system is de-energized before beginning any duct modification work. Secure the frame to the duct or framing opening using appropriate sheet metal fasteners, and ensure all edges are sealed per local mechanical code requirements to prevent air leakage.
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