Let's say you have a (stealth) grow box which is split into two chambers (veg/flower OR mother/clones OR seedlings/big). The total volume of the planned box is about 9.3 cubic feet. Do you think a 250 CFM inline fan, drawing air from both chambers (hose/pipe running into each) would be enough if used in conjunction with PASSIVE intake vents? I think it it should, after all the CFM rating is 26 times the actual volume of the box. Basically, I am trying to save money and streamline the design. I would prefer passive intakes since it means less noise, less money and less electrical stuff (wiring, power bill etc). ANyone want to chime in? Advice from growers using passive intake most welcome!