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Thread: fans

  1. #1
    Low Bitrate LudeAtude's Avatar
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    fans

    is it better to have them push air in or pull air out.
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  2. #2
    Maximum Bitrate eCarô's Avatar
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    No. It's better to have them pull air in, and push air out.

  3. #3
    Raw Wave hijinks21's Avatar
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    yes what he said.. if you only can use one.. i'd say pull the car out as close to your cpu as you can get
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    Maximum Bitrate binary.h4x's Avatar
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    Yup, by only having an exhaust fan, you are creating a lower pressure in the case than outside, thus running cooler. If the pressure was greater in the case than outside of it, then the inside of your case would turn into an oven.
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  5. #5
    Maximum Bitrate eCarô's Avatar
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    Quote Originally Posted by binary.h4x
    Yup, by only having an exhaust fan, you are creating a lower pressure in the case than outside, thus running cooler. If the pressure was greater in the case than outside of it, then the inside of your case would turn into an oven.
    Can you explain this to us laymen?

  6. #6
    Constant Bitrate
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    Personally I like it running pulling air in. Dust is less of an issue since you can put a filter on it that way. As long as you have a good airflow going, it won't make that much of a difference.

  7. #7
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    ohh boy....the infamous "push/pull" question...

    I have seen this raised on several PC related forums. Some people have strong opinions both ways. Every time I have read about someone actually TESTING a theory, it seems to make little to no difference.

    I personally *believe* that actual airflow is more important than the push/pull question. Your typical PC case is far from airtight, so it's not going to develop much of a pressure differential, even IF you had several 120mm fans all pushing (or pulling) in the same direction.

    Some fans get better CFMs in a 'push' configuration, while others are better in a 'pull'. The manufacturer might be able to tell you if you knew where to look, but most likely you'll just have to try it out both ways and see.

    Of course, I'm assuming that you only want to have 1 or 2 fans (as in most car PC applications). It can get really complicated with more fans.

    If someone knows of any comprehensive testing with reasonable techniques and data, I'd love to see it!

  8. #8
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    Quote Originally Posted by LudeAtude
    is it better to have them push air in or pull air out.
    Both.

    http://www.techtv.com/screensavers/m...505945,00.html

  9. #9
    Maximum Bitrate eCarô's Avatar
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    Quote Originally Posted by eCarô
    No. It's better to have them pull air in, and push air out.
    Maybe it's better if they are sucking air out, or cramming air in. Or maybe blowing air thru.

  10. #10
    FLAC samc's Avatar
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    what I do is always put 1 for in, 1 for out. but I've never really thought about air flow..etc.. so I could be way off.
    Mine needs to be updated.

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