Hello! We are considering installing an exhaust fan at the top of the coop to increase ventilation. My husband is a computer guy and has tons of those computer case fans. He was thinking of putting two in the coop instead of buying an official exhaust fan. Anyone ever do this? Any thoughts? The coop will be 6'W x 8'L x 6'H. One other thing, if we have gable and soffit vents at roof level, do we need ventilation at the bottom of the coop? I'm worried about drafts if we put something at the bottom, especially in cold weather. Thanks in advance for your suggestions/advice!