On Feb 19, 12:38 pm, "trs80" wrote:
Would a small shop DC system run ok with the mains at 4" smooth bore PVC
ducting vs 6"? I would have about 30' of main and 4 drops using a 2hp
1600cfm unit and air blocks for the station no used. The DC has a 5" intake
and 12" impeller.

I cannot find locally PVC 6" sewer and drain pipe. I can find galvanized 6"
duct at about $1.40/ft and 4" smooth bore S&D PVC pipe at $0.58/ft. I hate
to spend more of the duct then the DC which would happen if I go the metal
pipe route.

I visited all local Home supply brands (HD, Lowes, CW) and all dont carry
over 4" pVC. And I called an irrigation supply and they dont carry the
light duty 6" PVC pipe (i think its schedule 2379 or something like that).
Im guessing that its not a big seller inmy area for some reason to do with
building codes for such things.

So any way, I was wondering how much performance I lose by going the 4" vs
6" route.

Any thoughts appreciated!

In sheer volume of air moving, quite a bit of "performance loss". But
with this much suction, I don't think you could improve the dust
collection any better than "all of it", which you'll probably attain
with this set-up. I think 4" is plenty for now, 'til you add on to the
shop.(grin) Tom