fans. In or out?


Which way around do you install a case fan for the best cooling?

  1. Blow air in

    1 vote(s)
  2. Extract air out

    5 vote(s)
By Spike ยท 13 replies
Mar 4, 2004
  1. Just a quick question about configuration of case fans. And of course, the question, why?
  2. StormBringer

    StormBringer TS Maniac Posts: 2,244

    in from front, out at back. It has been discussed here many times in the past.

    You want air to flow through the case, since hot air rises, you position a fan or fans in the front near the bottom to pull air into the case, then position fans in the rear higher, blowing air out.
  3. Spike

    Spike TS Evangelist Topic Starter Posts: 2,168

    Oh, thanks. Am I to take it then that there's not much point just having the one sucking air out at the back?
  4. StormBringer

    StormBringer TS Maniac Posts: 2,244

    if thats all you got, but I'd recommend you add one to the front pulling air in.
  5. Vehementi

    Vehementi TechSpot Paladin Posts: 2,704

    For a 2nd opinion, yes, optimally your fans should be blowing air in in the front and out in the back, exactly what SB said.

    I would also reccomend an intake fan if you only had one.

    If you get more case fans in the future, be sure you're running at a balanced pressure with the air outside. Don't set 3 fans to intake and 1 for exhaust, but rather 2 for intake and 2 for exhaust. If they weren't balanced you would be either pushing too much air into the case or sucking too much out, which is horrible airflow. Always keep it balanced.
  6. Didou

    Didou Bowtie extraordinair! Posts: 4,274

    Actually, if only one fan is installed, it would be better for it to be an exhaust fan.

    The exhaust fan will remove all the hot air lingering around the socket area, whereas with an intake fan alone, cool air will come at the bottom of your case & stay there. The hot air around the socket area will remain in place so the intake will only be dusting up the inside of your case.
  7. (=DoM=)

    (=DoM=) TS Rookie Posts: 230

    They should make cases out of some kind of material which lets air through its surface but doesnt let dust in, like some kind of mesh, that would almost eliminate the need for noisy fans.

    Either that or make water coling a lot cheaper, im plannign on getting a water cooling kit in a few months, but im extremely scared about fitting it. 1 drop of water is all it takes to completey b0rk your entire system
  8. StormBringer

    StormBringer TS Maniac Posts: 2,244

    The mesh idea has a single fatal flaw, it would become a dust magnet and as such would also be a huge shroud of static around your precious components.
  9. SubKamran

    SubKamran TS Rookie Posts: 166

    I have 2 in the back and one on the side. Should the side one be pulling air in?

    And, I want to be some more fans, should I buy 1 or 2 for the front?
  10. XtR-X

    XtR-X TS Rookie Posts: 863

    Side push air inside.
    Front push air inside.
    Rear push air outside.
    Top push air outside.

    It never hurts to have enough fans... buy all you can...
  11. Didou

    Didou Bowtie extraordinair! Posts: 4,274

    The more fans you have, the harder it is to control the airflow.

    A few well placed fans will do wonders without making too much noise.
  12. Hedgehog

    Hedgehog TS Rookie

    That's weird..the case fans in my tower (one on top and on the side) suck air in the top...and out the
  13. Godataloss

    Godataloss TS Rookie Posts: 482

    From a ventillation standpoint, it will always be benificail to have a negitive pressure area inside the case as this will draw air into the case through the ventillation slots and out the exhausting fan. If you have fans blowing into the case at a faster rate than they exhaust it will create a positive pressure in the case and it will be harder for the hot air to escape. Rather than add a bunch of new fans, get a single large exhaust fan and add ventillation holes where you need them. This should also cut down on the dust inside the case as you will be sucking in less airborn particulates.
  14. XtR-X

    XtR-X TS Rookie Posts: 863

    But when controlled, the results are better. Never hurts.
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