im running a 1000 hps in not even 4x6 and i battled that for awhile... i found what works for me is more exhaust than intake, not too much more or u will get a vaccuum affect and thats BAD, i find just run your exhaust when ur lightis on and have your intake kick in when your thermostat tells it to
kent tha killer Reviewed by kent tha killer on . Negative/Positive Air Vent Pressure??? . So when you build vents, whether it's for a grow room, or a whole building, theres a whole scientific theory behind whether the intake or the exhaust should be more powerful, vacuum and all that stuff. I seem to remember that the exhaust should be more powerful than the intake, can anyone confirm or refute please? I've googled like mad, but I just can't find any good answers and it's time to get building a proper space... I'd be really greateful for any help. Thanks! :pimp: . Rating: 5