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- Nov 25, 2015
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- 10,040
4" duct with how many cfm dust collector?Maybe grinding dust will work out OK, but I have been disappointed with the performance of 4" ducts on metal chips. I have a 2.5" shop vac and hose that works well, even with long curly chips.
I'm with Eddyde on rigid pipe as much as possible. It doesn't slow the air down as much as hose, so it helps to keep the draw up.
Slow sweeps are important.
A vac and dust collector operate differently. A vac will move the grid and swarf if it catches it. A DC's job is to GET IT. The idea is to catch more air and catch the stray dust that is a little further away from the pickup. I like PVC pipe for a DC. The problem I have with metal piping is that if you go cheap and go with HVAC pipe, the seam slows the flow down, and it leaks. You need to go with the next level , which is DC pipe to do it right.