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This will depend greatly on the filter you want to use. A flat filter will need to be larger than a pleated filter. Determine what efficiency you need from your air filter. Look up the maximum "face velocity" across the filter, most are around 500fpm. Divide the blower cfm by the filter fpm and you will end up with ft2 or filter needed. Let's do an example of a 2000cfm blower with a filter that requires a face velocity of 400feet/min. 2000ft3/m / 400ft/m = 5ft2 or (1)24"x30" filter.
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