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I don't currently have intake fans, is a passive system not pheasable in my situation? If not what fans do you suggest. Lowes has 250 Cfm Inline fans available for $30. That's the cheapest I've found readily available arm. Or could I use cheap window fans for my intake and would the cut to fit...

I've recently built my first grow room and am having probs getting the temp below 90 degrees. The dimensions are L14xW4.5xH6.5. That puts me at about 410 cubic feet. I have a 170 Cfm exhaust fan mounted externally to remove air from the room which should probably t me exchanging the air every...