Originally Posted by
Andrew More
That hasn't been my experience with the fittings I've gotten from the local HVAC supply house. Instead they seem to be designed to be crimped in the field.
I've only seen pre-crimped, but if you have uncrimped available, that's great. Just be sure to take care in sealing them up...one of the downsides to HVAC wyes is that many of them are just spot welded and need to be fully caulked/taped for "our" application. In a house, a little escaping heat or cool air isn't a terrible thing, but in dust collection, you want no leaks if you can help it.
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The most expensive tool is the one you buy "cheaply" and often...