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The SOUTHWARK METAL 35A_2IN is a cut-in sheet metal trunk duct reducer designed for use in forced-air HVAC duct systems. Fabricated from hot dip galvanized steel, this reducer transitions airflow within a trunk duct run by allowing a branch tap or size reduction to be cut directly into an existing duct section. The cut-in design simplifies field installation without requiring full duct replacement. HVAC sheet metal mechanics and ductwork installers rely on this type of reducer when modifying or extending existing trunk duct layouts to balance airflow distribution across a system.
This reducer is suited for residential and light commercial forced-air HVAC applications where sheet metal trunk ducts are the primary air distribution method. It is installed directly into the trunk line at the point where a size transition or branch connection is needed. The cut-in configuration is a standard approach in duct modification work, particularly during renovation, rebalancing, or system expansion projects where the existing trunk duct remains in service.
Designed as an OEM-style replacement and standard-fit component for sheet metal trunk duct systems in residential and light commercial forced-air HVAC installations.
Installation should be performed by a qualified HVAC technician or licensed sheet metal mechanic. Power down the air handling equipment and verify the system is off before cutting into or modifying any duct section. Sheet metal snips, a duct knife, and appropriate fasteners or drive cleats are typically required for cut-in reducer installation. Follow SMACNA ductwork installation standards and local mechanical codes for sealing, support, and fastening requirements.
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