tr wrote:
I have a 2 hp Jet dust collector...my first...there are two 4" intakes
on the unit....is it best to run 4" hose around the small shop rather
than 3"...etc...and when dropping to a tool...should you keep using
mostly 4"...or is it ok to drop down to 3" or 2 1/2" at the split off
fitting to the stationary tool ?

Thanks, TR

I think anyone setting up a dust collection system should read Bill
Pentz's discussions at
http://billpentz.com/woodworking/cyclone/Index.cfm

Even if you don't buy into everything he says about the health hazzards
of wood dust, he's done a lot of research and gives a lot of good, free
advice. You'll find your answer there, along with a lot of answers to
questions you may not have thought of yet.

DonkeyHody
"If your only tool is a hammer, you tend to see every problem as a
nail." - Abraham Maslow