Quote:
Originally Posted by GreenDragon2k  CFM requirement depends more on lighting than the size of your space. So instead of calculating by size and times per minute... Just divide your wattage in half and you'll get the approxamate required CFM...
So if you've got a 400w HPS then you'll need at least 200 CFM of exhaust. | Cool, never heard of that ratio, but I done good on accident. I run 2200w (formerly 2000w) and I run 1000 cfm. In a 250 cf room that's 4 times a minute, but my room is really small for what I grow, more like a giant cabinet. Plus AC 
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