As published by Conklin Metal Industries in “What are the Basic Machines Every HVAC Duct Shop Must Have?,” Harry Thompson IV explains that rectangular duct fabrication centers on longitudinal and transverse profiles, so the “must-have” equipment typically supports building those connections efficiently.
A Pittsburgh machine is called out as a core starting point because it rollforms the female pocket seam, and Pittsburgh is widely used as a standard lock in commercial HVAC ductwork. The same Conklin resources also reference equipment that supports common duct connection work, including drive turn (cleatbender) and slip-and-drive rollformer setups used in everyday rectangular duct assembly.
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Article with all rights reserved, courtesy of Conklin Metal Industries —-https://www.conklinmetal.com/