Reply by Manitario

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Posted on Calculating CFM and Static Pressure.... Confused

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2631 posts in 3030 days

#1 posted 10-30-2016 12:43 PM

A lot of helpful comments and advice above. Dust collection has been made into an (often) hugely complicated issue, partially by misinformation from manufacturers and partially by a lot of inaccurate stuff online.
Figuring out what DC you need and/or what sort of set-up can be made a lot simpler;
1)Find a good static pressure caluculator eg. as BobAnderton mentioned, the Bill Pentz one is the simplest and easiest to use of all that I’ve seen (the one in the Grizzly manual is horribly complicated to figure out).
2)Figure out the max static pressure for your system, ie. the longest run with the smallest diameter pipe.
3)Plug this number into your fan curve to determine what CFM you’re going to get from your DC.

This will give you a pretty good approximation of what you’re going to get from your setup.

As for your specific DC; it has a massive impeller, which is great for CFM; but is a small motor which means it won’t tolerate much static pressure in your system without huge CFM drop-off.

-- Sometimes the creative process requires foul language. -- Charles Neil

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