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  1. #1
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    Case top fans blow out or in?

    Hi all,

    I'm setting up a Corsair H100i rad in the top of my Cosmos 2 case and I'm wondering which way the fans should be facing in order to get the best cooling. I've heard that it's best to have them blow the air out of the case since hot air rises and it makes little sense to blow it back down into the case. However, I would like to get some opinions on this.

    Thanks!

  2. #2
    ROG 師傅 Array Arne Saknussemm PC Specs
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    This is a common fallacy propagated on the internet...among many others...

    Fact is, hot air rises with a force millions of billions of times less than the force of a fan and hence cooling the radiator with cool air directly from outside the case will give the best cooling.

    This is of course only true assuming you are not pumping air into the case everywhere else...if all the case fans are intakes positive pressure will cut airflow....just make sure if top is intake you have exhaust set up at back or sides or bottom...etc.

    At the end of the day heat removal is about flow..however you can arrange for the highest flow through the case..taking into account the siting of your case...that will give the best cooling...
    Last edited by Arne Saknussemm; 08-16-2015 at 09:22 AM.

  3. #3
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    Thanks again, Arne.

  4. #4
    ROG Member Array errornosignal PC Specs
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    Removing heat from a radiator is more effective in cooling than blowing cool air on it. Not to mention the fact that paddling with the current is much more efficient that paddling against it.
    Last edited by errornosignal; 08-24-2015 at 10:57 AM.

  5. #5
    ROG 師傅 Array Arne Saknussemm PC Specs
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    Quote Originally Posted by errornosignal View Post
    Removing heat from a radiator is more effective in cooling than blowing cool air on it. Not to mention the fact that paddling with the current is much more efficient that paddling against it.
    Thanks for making my point for me

    Removing heat from a radiator is done with flow and as cool air as possible...

    There is no current....it's like saying driving against continental drift is slower than driving with it....

  6. #6
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    Quote Originally Posted by Booska View Post
    Hi all,

    I'm setting up a Corsair H100i rad in the top of my Cosmos 2 case and I'm wondering which way the fans should be facing in order to get the best cooling. I've heard that it's best to have them blow the air out of the case since hot air rises and it makes little sense to blow it back down into the case. However, I would like to get some opinions on this.

    Thanks!
    Every Corsair cooling kit I have installed in any case has had the cool air come in through the back, across the radiator, with a well-vented case top and fan blowing out. Never an issue. That being said, I have always made sure I have a postive pressure in the case, so the air takes the path of least resistance; out the top.

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