More Intake or Exhaust?

Discussion in 'Grow Room Design/Setup' started by Makizushi, Oct 19, 2009.

  1. #1 Makizushi, Oct 19, 2009
    People of Grasscity, I would like to know whether there should be more fans for exhaust or intake...

    In the case of passive intakes, do I need a lot or what?

    Help meee!
     
  2. #2 killermiller, Oct 21, 2009
    your passive intake should be a size larger than your active exhaust.
     
  3. #3 Nonexistium, Oct 21, 2009
    absolutely, i would even say 50% bigger IMO. You have to keep the air moving, and the fans can only do so much to scavenge air out of the container (they are not pumps), so it is best if you do not try to make the fan work too hard to get the air out, it will be operating below its designed efficiency.
     
  4. #4 randumbdude, Oct 22, 2009
    More exhaust. 2 to 1 ratio is ideal. I run a 4 5/8 in exhaust with a 3 5/8 in active intake and another small passive intake for wiring. Works for me.
     
  5. #5 killermiller, Oct 22, 2009
    By forcing air in, you generally lose control of smell.
     
  6. #6 fluffygrrrl, Oct 26, 2009
    the jorge cervantes bible says to do 4 to 1. If exhaust is 400 cfm, then intake should be 100 cfm. So many different opinions have made this frustratingly difficult in planning my exhaust system.
     
  7. #7 randumbdude, Oct 26, 2009
    i think the most obvious lesson to walk away with is more exhaust than intake. period.
     

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