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The SOUTHWARK METAL 58_16X12 is a 3-piece sheet metal pipe reducer designed to transition round duct from a 16-inch diameter down to a 12-inch diameter. Fabricated from hot dip galvanized steel, this reducer delivers corrosion resistance suited to both supply and return air duct systems. The no-crimp design accommodates installations where a plain end is required for a specific fitting connection. HVAC sheet metal mechanics install this fitting in low-pressure forced-air duct systems during new construction and retrofit work.
This reducer is used in residential and light commercial HVAC duct systems where airflow must be stepped down between trunk lines and branch runs. The 16-inch-to-12-inch transition is common in main trunk-to-branch configurations. It conforms to ACCA and SMACNA standards, making it appropriate for code-compliant duct fabrication and installation on permitted projects. The 3-piece construction is standard for larger-diameter fittings where single-piece forming is not practical.
Designed as an OEM-style replacement and new-installation fitting for round duct systems requiring a 16-inch to 12-inch reduction in residential and light commercial forced-air HVAC applications.
Installation is performed by licensed HVAC technicians or sheet metal mechanics. Power down the air handling unit at the disconnect before accessing the duct system. Secure the fitting with sheet metal screws and seal all joints with UL 181-listed duct sealant or foil tape per SMACNA guidelines. Follow local mechanical code requirements for support spacing and joint sealing.
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