When used for heating, ventilation, and air conditioning (HVAC) systems, sheet metal requires specialty machines to form all the connections necessary for duct work. Various rotary machines are available for crimping, beading, and flanging. You'll also find HVAC machines for forming drive cleats, S cleats, the popular Pittsburgh seam, and much more.
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Running a small business takes a lot of work. Every time I deal with trick tools I am reminded that customer service and a knowledgeable staff still do exist. Nothing worse than calling about a product and finding you know more about it than the "expert". These people know their stuff, you can just tell. The quality of the tools is first-rate. Service excellent. If you make your living with tools and need dependable equipment delivered in a timely manner look no further. If you are a beginner don't feel intimidated, they never make you feel like you asked a stupid question. Just tell them what you're trying to do and they will set you up with what you need and not sell you stuff you don't need.