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Default 4" vs 6" ducting for effective dust collecting

On Sun, 22 Jan 2006 20:07:12 -0700, "mywebaccts (at)"
"mywebaccts (at)" wrote:

I'm reading "Bill's Place" (Bill Pentz) and his writeups on what does or
doesn't constitute an effective dust collection system. He insists that
4" ducting is woefully inadequate for safe dust collection. He writes
that 6" is what is needed.

His writeup gets fairly technical and sounds very convincing. But of
course, using 6" ducting greatly increases the cost of the ducting for
my workshop.

Are there other opinions on this or do people pretty much agree that 4"
ducting is inadequate?


I agree that six inch piping is much better than 4, although a bit
less practical for a typical (home) workshop. Pi R squared shows 12
vs 27, meaning that the 6" pipe can move over twice the volume as the
4" pipe in any given time. Now whether the 4" piping is inadequate or
not depends on how quickly sawdust will be produced.