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The SOUTHWARK METAL 35A_6IN 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 allows technicians to branch off or reduce airflow from an existing sheet metal trunk duct without full duct disassembly. The cut-in design means the fitting is installed directly into the side or face of the trunk, making it a practical solution for adding or modifying supply runs during new construction or retrofit work. HVAC installers and sheet metal workers rely on this type of fitting to balance airflow distribution across duct systems.
The 35A_6IN is suited for residential and light commercial forced-air HVAC installations where sheet metal trunk duct is the primary distribution method. The 6 inch size accommodates standard 6 inch branch duct connections. It is appropriate for new duct installations as well as retrofit or repair applications where an additional supply run must be added to an existing trunk line.
Designed as an OEM-style cut-in reducer for use with sheet metal trunk duct systems in residential and light commercial forced-air HVAC applications.
Installation is typically performed by a licensed HVAC technician or certified sheet metal worker. The air handler or furnace should be powered down and the system shut off before cutting into any trunk duct. Sheet metal snips, a hole saw or jab saw, and sheet metal screws are standard tools for this type of fitting. Duct installations should comply with SMACNA duct construction standards and applicable local mechanical codes.
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