How to Crimp Ducts in the Field
More on Ductwork
When you buy factory-made ductwork, it comes with one end crimped to slide easily into the connecting piece. To make use of ductwork cutoffs you can use duct crimpers to simulate that same connection. Duct crimpers work like a pair of pliers, squeeze the handles together and the staggered jaws deform the metal into a corrugated pattern.