Originally Posted by 6cylindersovertexas
So this thread does beg the question - how do you know what cfm a particular fan will move? Is there a formula for obtaining such a number?
I haven't seen a fan made that has that information anywhere on the fan.

At least one site I have bk marked gives that info for SPAL elec fans...

www.a1electric.com/catalog/cat_spal.htm

Mark
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