Toller - with 4" at the bottom, you don't see any problem with the larger
line 'stealing' efficiency from the top, smaller line ? Or vice versa (I
don't know a lot about the velocity changes etc that would occur) ?

jim

"toller" wrote in message
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I have a 4" port in the base of my router table to the DC, and a 2.5" pipe
goes from the base to the back of the fence. It is pretty much dust free
when I use the fence. Without the fence it is still pretty dusty.