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10 x 10 x 8 = 800 cubic feet. you need minimum a 800 cfm fan. or divide your room in 2 and use 2 fans is what i would do. i have a 450 cfm fan that i paid 80 bucks for used and it works awesome. i also have a speed control on it. dont forget you will need some extra cfm on the fan size to allow for back pressure from filter
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