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EDIT: Was way off with that intake. It should be something like 56.5 square inches.
Saw this chart and figured I'd spread the love. I am personally having issues with heat in my current "grow cab" and felt that this chart would help future growers to avoid this flaw. Luckily for me the seeds were bag seed....sadly for them and me I think they're beyond repair at this point in the game with the equipment I have now.
Also, found out a good rule of thumb is to have twice as much intake as you have exhaust. So if your exhaust is 6" diameter then you would need to have something like 28.2" square inches of intake.
I think a major factor that this formula completely neglects is the ambient temperatures of the air that is being pulled into the room. Ambient temperatures are going to determine how much heat you have a lot more than how much air you are moving, IMO.
All I know god damn it is that I'm gonna have a something like 400 CFM's being pulled out of my 25 CF closet ! I hope it's enough . So if the closet ain't at ambient then I have problems....serious problems....like defying the laws of physics problems.
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! I hope it's enough 
. So if the closet ain't at ambient then I have problems....serious problems....like defying the laws of physics problems.
