Yes it does help! I figured something along those lines. I should clarify, this is not a tent. The only exhaust (6" 218 cfm) I have running right now is filtered through a Can-Filter 33. That must lower my cfm, right? The intake is a 5" 149 cfm. Is that a sufficient difference?Yeah bro its easy! As long as your intake fan (cfm) is
smaller than your exaust fan (cfm) you are creating
negative pressure!! Hope this helps ya!