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Thanks guys, so how big of an intake are we talking here? a fan with 8 inch blades? or will a computer fan do the trick? its 340w (150 hps, 70 hps, 120 fl.) and the weather here is quite hot... I was also thinking of my exhaust being two computer fans, slapped up against each other (maybe...

I sealed off half of a small storage room with a white glossy tarp. I will cut an airhole and place home made scrubber as an exhaust, but my question is: Do I need to somehow place a filter where the air intake fan is? ... to control smell?