I am putting together a grow box 42"H X 36"W X 20"D. I want to use a 400W HPS air cooled light 6". My question is how powerful should the exhaust fan be,cfm wise? Also kinda new to this, is there only one exhaust fan used and the other end left open or is there an intake and exhaust, one at each end??
This is as much a question as an answer, but can the fan be to strong? i have a dual fan window fan in my grow area, using the "Exchange" function, and my plant are under a pretty constant wind, i feel lik eit just give them more air and strengthen their stems.