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direction of airflow of processor fan

Discussion in 'Tech Talk' started by David_G17, May 21, 2005.

  1. David_G17

    David_G17 /\/\/\/\/\/\/\/

    Oct 7, 2002
    is the CPU fan supposed to blow air onto the heatsink or pull air away from the heat sink?

    or does it vary with manufacturer?
  2. pyblood


    Dec 22, 2003
    Every CPU fan that I have ever seen blow air onto the heatsink.

  3. NRA_guy

    NRA_guy Unreconstructed

    Jun 20, 2004
    Mississippi, CSA
    I imagine that most would blow towards the heatsink.

    That eliminates any concern about physical orientation.

    Otherwise, because heat rises, it would make a slight diference which direction was up.

    PS: Ever try to suck out a candle flame? It's hard to do and you would have to be really close to the flame, but you can easily blow out a candle from some distance away. Same difference between a vacuum cleaner and a leaf blower. The velocity created by sucking (or, air intake) is a very localized effect. It's a fluid mechanics thing.
  4. fastvfr

    fastvfr Ancient Tech

    Mar 28, 2001
    SW Oregon
    I use this CPU cooler in my gaming rig:

    It blows air down through the fins which results in it actually cooling the entire motherboard and all its components with the flowthrough from its open design. It really can't plug up with dust, either.

    This 120mm fan really moves some air. BTW, this is the Zalman CNPS 7700Cu, which weighs in at just over 900 GRAMS of solid copper!

    Not for the faint of heart or the flimsy MOBO's!!
  5. David_G17

    David_G17 /\/\/\/\/\/\/\/

    Oct 7, 2002
    weird; i've been looking at that exact fan/hs on newegg for a while.