Fan blowing direction?

Discussion in 'Computer Cases, Power Supplies and Cooling' started by Stildawn, May 13, 2009.

  1. PohTayToez

    PohTayToez Active Member

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    4,873
    I would say that you would only have Fan 1 as intake, like Mitch said, creating a nice airflow from the front of the case to the back. Fan 6 should always be outtake, so that it expels hot air coming off of the CPU and GPU. I would also say that 4 should be outtake. Having it blowing in would mean that the air would come and hit the hot part of the motherboard on the other side of the CPU, but then the air would have no where to go. Making it outtake would create a current coming from the edges of the motherboard and exhausting the hot air from the other side of the CPU.
     
  2. Stildawn

    Stildawn New Member

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    1,734
    So the stock 120mm side fan (fan 6) as a exhust? I would have thought to have it as a intake? Its more to the front of the case than the back?
     
  3. Mitch?

    Mitch? banned

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    2,983
    [​IMG]
    Green for intake, Gold for exhaust. I also drew you a pretty sweet PSU, which will be exhaust no matter what, if the fan faces the ground it'll take most from outside the case anyway, if you get it to face up (which i'd try, it's way more functional and prettier) then it'll also help take any heat away from the generally >80*C videocard.

    You also have a spot for an optional bottom mounted 120mm fan. If you choose to install it, have it as intake. Without a fan, the vacuum effect created by the negative draw of your exhaust fans will take alot of air from this hole anyway, so a fan isn't necessary at all.

    The side mounted fan is about 4/5th to the back of your case, and vertically centered, and should be exhaust, primarily for the videocard.

    So it's:
    1,2, possible bottom 120mm fan = Intake
    3,4,5,6,PSU = Exhaust
     
    Last edited: May 18, 2009
  4. Stildawn

    Stildawn New Member

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    1,734
    And what about fan 4 lol.

    Man this stuff is complex, way more than I imagined. lol..

    Do you happen to know the airflow direction of a V8? Cause wont your diagram above only work if the V8 fan is blowing towards the back?
     
  5. Mitch?

    Mitch? banned

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    2,983
    sorry. 4 is exhaust also. edited my post to state that just now :)
    and the V8 will either blow to the back or the top, either way, the fan layout i have will work.
    I'm PRETTY sure (>95%) that it blows to the rear though.
     
  6. Stildawn

    Stildawn New Member

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    [​IMG]

    If its this way, depending on the fan direction will blow either forward or front. If it blows front will ruin airflow hard out.

    I might do some more research on it surely it must say somewhere.
     
  7. Stildawn

    Stildawn New Member

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    1,734
    [​IMG]

    This looks promising... Ok your plan looks good haha sounds like you know your sh*t lol.
     
  8. PohTayToez

    PohTayToez Active Member

    Messages:
    4,873
    In reference to Mitch's diagram, I would say that having Fan 3 and Fan 4 blowing different directions would be a bad idea, and most likely just waist air flow.
     
  9. bomberboysk

    bomberboysk Active Member

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    13,257
    Id say fans 1,4,5 intake and the rest as exhaust, side should be exhaust also to remove heat from gpu/etc.
     
  10. Stildawn

    Stildawn New Member

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    1,734
    I think the idea of fans 2 and 3 being opposite is to cycle the air through my Cooler Master V8 which will draw the "cool" air coming in from fan 2, use it and then fan 3 will get rid of the hot air.
     
  11. StrangleHold

    StrangleHold Moderator Staff Member

    Messages:
    19,543
    1. Intake
    2. Exhaust
    3. Exhaust
    4. Exhaust or Intake. Doesnt really matter
    5. Exhaust
    6. Intake
     
  12. Ramodkk

    Ramodkk VIP Member

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    8,503
    Or, you could flip the fan :p

    Best setup is simple. 1 x 120mm intake and 1 x 120mm outtake ;)
     
  13. Stildawn

    Stildawn New Member

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    1,734
    So I just found out much to my disgust that my 80mm x 25mm case fan can not fit in the behind mobo position as its too large (needs to be 15mm)

    So Im left with a rather expensive 80mm fan.

    What would you guys do? Is there away to front mount it in the CM690 to help out the front fan?

    Cheers

    [​IMG]
    Fan 4.
     
  14. bomberboysk

    bomberboysk Active Member

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    13,257
    Hmm, maybe find a way to mount it so it blows into the intake of your graphics card?
     
  15. Stildawn

    Stildawn New Member

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    1,734
    Lol like underneath it?

    I could mount it in the bottom slot near the front. Using cable ties or something.
     

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