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Thread: case fan airflow "rule of thumb" help...




  1. #1
    Join Date
    Aug 2003
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    Hey i know ive seen it before but whats the rule for fan placement with air flow(intake/exhaust)say you have a computer with front and rear fans and a fan on the top of the case and one on the side panel? thanks for any input
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  2. #2
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    not blow.......from the power supply and probably top of case as well .............to blow, out the sides and front

  3. #3
    Beefy Guest

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    Is it just me, or was that confusing?

    Basically, you want air to flow through the case from front to back. So any fans on the front should be intake fans (suck the air in), and fans on the back should be exhaust (blow air out). There's also a bit of debate as to what fans on the side of cases should do. I think most people have that as an intake as well.

  4. #4
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    Yep, an intake fan in the side is great to blow fresh cool air on your graphicscard etc.. :)

  5. #5
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    And the fan on the top should be an exhaust to get all that hot air (that wasn't blown out by other fans) that rises from the CPU and PSU out of there as well :thumb:
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  6. #6
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    Maybe a pic will help? :?:

  7. #7
    Join Date
    Aug 2003
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    wow...thanks everyone for all the help i really appreciate i guess i had my fans set up properly. eflo'
    http://sigx.yuriy.net/images/xefloetry83.png
    AMD Athlon XP 2800 Barton
    FrozenCpu.com(Blizzard) Mid tower 2-120mm 2-80mm all voltages controlled
    Enlight 420W Dual Fan PSW
    Thermaltake Volcano 9
    Leadtek WinFast K7NCR18G-Pro nForce MB Dual DDR memory architecture
    2x256=512mb DDR Samsung 2700 333mhz bus
    GF4
    17inch LCD Pixo at700s
    logitech mx700 wireless
    40GB Western Digital "SE"
    30GB Maxtor 7200 ATA133

  8. #8
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    Just like to add 1 thing. I heard somewhere that you want to have an equal amount of intake/exhast fans, as well as having them at the same speed would be ideal. Never set up case fans before so dont take my word on it, but I think it was wiggo that told me that.

  9. #9
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    Yep slightly more in than out which stops the buildup of "fur balls" around seams. I can't find the current cfm spec's for Antec's TRUE430 PSU and 1080AMG case right now (they use to have them and it stated 32cfm PSU and 2 x 36cfm case) and I add the extra 2 case fans with 36cfm fans (108cfm in and 104cfm out).

    Well it seems to work well with me here so far as case/system temps are -/+1C within room temps with that arrangement over both P4 and Athlon setup's w/ Volcano 7+'s and pretty quiet compared to some others that I've seen and owned (but then again bein' surrounded by 6 similar setup's here in the shop does make for a low buzz thru the place but nothin' that WinAMP and a set of Z-640's can't easily fix). :shrug:

  10. #10
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    Sep 2003
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    so, therefore i may be wrong.............but, one day a friend of mine was flipping the fan on the power supply............his response was that it was more important to draw cool air in over the power supply and exhaust it out the front????

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