Just remember that if your exhausting 2,000 cubic feet of air per minute, you have to have 2,000 cubic feet per minute of air for supply air or you could theoreticaly suck that little grow room inside out.
Mississippi Steve Reviewed by Mississippi Steve on . squirrel cage fans anyone here currently using a squirrel cage fan as a exhaust fan? yea i know a inline fan is much better, but in my case the fan is free. i recently installed a new furnace and looking at the old unit i noted a fairly new squirrel cage fan in there so i ripped it out for use another day. not sure the cfm's but i do know it was a 125,000btu furnace, and a nice sized fan about 18in tall and atleast 12in wide. fan also has a hi/lo feature. fired that sucker up and it does move some air. Rating: 5