I'vs always been a "fan" of pulling air thru anything rather than trying to push it with the Dayton squirrel cage fans. #2 would be my choice. That allows the possibility of creating a negative pressure room and that will easily allow you to totally control the incoming air, the temp, humidity, and co2 if used. All you need with a negative pressure room is an envrionmental controller. That will allow you maintain the best growth conditions day or nite, winter or summer. Good luck
oldnslow Reviewed by oldnslow on . Ventilation Question Ventilation question I need answering, two potential setups, which one would work better? 1) Carbon filter at the top of the room, connected directly to an extraction fan. Fan sucking air through the filter, blowing air through ducting into an air cooled reflector, ducting connecting the adjacent end of the reflector taking air out of the grow room. 2) Carbon filter at top of the room, filter connected directly to ducting, ducting connected to air cooled reflector, adjacent end of Rating: 5