Reply by crank49

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Posted on Dust Collection 5" to 6"

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4032 posts in 3000 days

#1 posted 11-06-2012 04:40 PM

It’s all a matter of balance.
Bigger pipe = lower velocity of the air stream
Lower velocity = less pressure loss
Less pressure loss = increased CFM
increase in CFM = more velocity
more velocity = increase in pressure loss
etc., etc.

There is one single simple answer to your question.
It depends on your collector, its CFM capacity at what pressure, what horse power, what length of duct run.
A Harbor Freight 2hp collector is optimum with a 4” and a 2-1/2” dict connected and both open at the same time, for instance. Your collector may have totally different characteristics.

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