I didn't want to hijack an existing thread, so starting another . . .
I've read and heard not to use HVAC pipe for your dust collection system. Why? Is it not heavy enough? Will the suction collapse the pipe? Is the seam leaking a concern?
I was at a home depot yesterday, picking up a HVAC vent, was standing right next to the HVAC 6" duct pipes so took a look at the pipe and it seems like it'd be plenty strong enough. To buy the spiral 6" dc pipe, it's around $40 for a 5' piece, while this stuff is $8.20 for 5'. I didn't see what guage the metal was.
My DC is a HF 2hp job that runs on 110v. I don't recall the CFM numbers on it (probably over exaggerated anyway).
What I want to do is run 6" mains, reduce to 4" at or near the tooling then 4" flex to the tool. Of course I'd have some 90's and Y's, probably less than 20' for my main run. I'll use some blast gates to control flow. I would tape up the joints and seams to seal it all up.
Unless you guys talk me out of it, I'm thinking of giving this pipe a try.