...I used a 400HPS light in my closet....cool air from the A/C..blowing in from the bottom...exhaust..going out the top....with a digtal temperature/humidity gauge...somewhere between the lights and top of the plants (not directly in the light)...I hear 1000HPS ..gets seriously hot....test everything....before you pop the seeds...
Dutch Pimp Reviewed by Dutch Pimp 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