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Squirrel Cage Blower Selection

We frequently here a question like this one: I have a squirrel cage blower and I'd like to build an air filter for my shop, but the blower doesn't have any markings so I don't know how much air it will move. How can I determine the CFM of the blower, and will the CFM affect the size of the filter I should use? It would seem the more air you're moving, the more square inches of filter you should have, or does it really matter ?



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