Hey guys, I've been gone for quite a while, busy with other things and such. But anyways, Ive got two grow rooms, one is 5 ft. squared, the other 7ft squared. My house has a shitload of cpu fans all lying around, different sizes and such. All them say the Voltage they need but no CFM rating. I don't know how many I need for each room either. Any hints? BTW I heard a good ventilated room needs fans at 200+ CFM rating which is crazy because most cpu fans are around 80-110 CFM a peice! Comments please.