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The Southwark Metal 35A4 is a 4in flat trunk reducer designed for sheet metal duct systems. Constructed of hot-dip galvanized steel, this cut-in trunkline fitting reduces trunk duct size while meeting ACCA and SMACNA standards. It functions as a transition fitting in HVAC trunklines and is compatible with standard sheet metal ductwork, providing corrosion-resistant connections and sizing for ventilation systems. Available as a cut-in style for installation in existing trunklines.
Cut-in trunk reducer for transitioning trunk duct size in HVAC sheet metal systems.
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