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1 cubic foot per minute is 28.317 litres per minute. See:

http://www.convertunits.com/from/litres+per+minute/to/cubic+foot/minute

So 1 cfm = 472 millilitres per second.

Look then on this page to convert ml to grams at a density you want.

http://www.ehow.com/how_4869894_convert-gram-liters.html

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