I think the rule is to exhaust up high and make your intake come in low. That way the high temps rise and get sucked out, and the fresh cool air comes in low. I think it would be fine to leave one end of the hood open to suck grow room air in. The hot air you are trying to eliminate won't have anywhere to go anyways. For an intake I just used a 20"x20" vent low on the wall and a box fan pulling air in through a filter. Also be careful venting hot moist growroom air into an attic because of mold risk to your entire home. I never really had to deal with smell when I was growing DP's Master Kush.
dejayou30 Reviewed by dejayou30 on . Ventilation Question I have a 6' square area that is about 6 feet tall for my grow room. I have a air cooled 600 watt hps/mh light. The grow room is located in my garage which has no ceiling and thus is exposed to the attic as well. I will be sealing my grow room off with a set of doors on the front much like a closet or something. The salesman at the local hydro store told me that the best solution is to run air ducting and a fan to the light hood and close it off from the circulation of the grow room but I Rating: 5