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I'd like to know this too! My 3'x4'x5' cab has a light exhaust, an exhaust, incoming vent, as well as circulating fan and it still gets close to 90 at the end of May. It gets rather warm here, and I see the next grow being done at night. I have at the moment I think nine plants, all of them neglected or tortured at one time or another, but doing pretty well, even with my interference.
My light can be placed within inches of plant tops w/o damage, the air intake is 90cfm as is the exhaust. The ballast is mounted on the exterior. Anyone have any suggestions??
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