go bigger than you need. you can always get a controller to crank it back a bit, but it sucks to be underpowerd. even bigger so if you are gonna be running an air-cooled hood(s).


-shake
headshake Reviewed by headshake on . best fan for exhaust purchasing gear for my first grow-room- need advice on exhaust fan- room will be 640sq feet-6" exhaust duct- nee d good fan , hopefully quite and affordable- have sen a lot of different fans, read all sticky's, still would like individual personal experiences and preferances Rating: 5