Reversing A Case Fan

By be_patient ยท 8 replies
Feb 6, 2007
  1. hi, i currently have a thermaltake tsunami, the model with the window.

    i have noticed that the side 90mm fan is situated directly above my cpu, this fan is sucking air into the case! i thought it would be better cooling for cpu if it was blowing air out, but i am far from sure about this.

    So i wondering does anyone know, is it better to have the air blowing on to the fan/heatsink on cpu, or is it better to have the air being sucked away from it and freeing up heat in the case?

    ...also if it is better to have it an exhaust fan, is there a way 2 reverse the fan, or do i just buy a new one?

    thanks, be patient
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    just turn the fan around, and mount it to change the direction of the air flow
  3. SNGX1275

    SNGX1275 TS Forces Special Posts: 10,742   +422

    If its on the side of the case and inline with the heatsink, you should direct the air inward. Because if you think about it, the heatsink fan is blowing air onto the heatsink, so you would want to supply it with fresh cool air by directing the fan to blow into the case.

    In general terms, fans at the front of the case should blow in, fans at the back of the case should blow out, fans at the side should blow in, and fans at the top should blow out. There are of course exceptions, but for most setups that is how it should be done.
  4. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    This sounds good to me... and if you ever want to change the direction of the air flow, just turn the fan around
  5. F1N3ST

    F1N3ST TS Rookie Posts: 596

    You can also reverse the positive and negative wires.
  6. agi_shi

    agi_shi TS Rookie Posts: 385

    I'm not too sure about that, while it ...technically... should work, most of my fans (actually, all but one) don't want to spin if I do that. And, you know, I DO want them to.... spin.
  7. F1N3ST

    F1N3ST TS Rookie Posts: 596

    Lol, really?
  8. be_patient

    be_patient TS Rookie Topic Starter Posts: 103

    thats what i thought and thats exactly what i needed to hear. thanks

    i read somewhere that if you do this then the fan is blowing against its design (spinning other way) and therefore severely lowers performance... not sure if its true though but sounds right because of the angles of the fins.

    thanks for all replies.... so i am best leaving it 2 blow in, beautiful less work for me. HAHA!

    be patient
  9. agi_shi

    agi_shi TS Rookie Posts: 385

    Yup, I'm not kidding. I accidentally put a fan on with zip ties the wrong way and didn't wanna cut the zip ties and do it all over again (hard to reach spot, didn't want to take PC apart). And then it didn't work, so I was forced to do it the hard way.
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