Exhaust Fan - 8x4

Hey I need an exhaust fan for a room 8x4

if my math is correct, @ 8x4 = 32sq ft = 320 cubic feet.

Does this mean im gonig to need a 900+ CFM fan??

I cant find oen.. im very confused on what ot use.

i think it means you need a 320 + cfm fan. The whole room needs to be exhausted every 1-5 minutes. a 320 cfm fan would exaust all the air in your room once every minute. The + is for distance in ducting, and a carbon filter, so you need maybe a 400 cfm fan.

wait, you only have two dimensions. volume of air in a room is Length x Width x Height .

[LxWxH] / 5 = CFM needed

465 cfm you'll be golden.....