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Your opinion on Positive or Negative case Pressure

post #1 of 8
Thread Starter 
I'm trying to find the best way to setup my fans in my case, but i couldn't decide if i should create positive or negative pressure inside my case.

I have one 60mm, one 80mm, and one 120mm fans.

I currently have a negative pressure, should I stay with that, or go to positive?

Whats your opinion on positive and negative pressure?

Thanks in advance thumbsupsmiley.png
 
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post #2 of 8
Ive always tried to stay with positive.
    
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post #3 of 8
Quote:
Originally Posted by Halostryker;12476247 
I'm trying to find the best way to setup my fans in my case, but i couldn't decide if i should create positive or negative pressure inside my case.

I have one 60mm, one 80mm, and one 120mm fans.

I currently have a negative pressure, should I stay with that, or go to positive?

Whats your opinion on positive and negative pressure?

Thanks in advance thumbsupsmiley.png

I'd say you need a new case. Then cut out the grill at the back and set your fans to make the air flow through your case. Positive pressure causes some points to stagnate. Negative pressure causes your case to act like a bagless vacuum cleaner and collect dust in all sorts of little corners, not to mention on top of your components.

Get some nice quiet fans, and with a non-restrictive channel for the air to go out, you have an air pressure that is only "positive" enough to move air.
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post #4 of 8
Positive. Air blowing on heatsinks > air only being pulled away.


Of course there needs to be some kind of exhaust, but having as much cool, fresh air coming in as possible will provide the best temperatures.
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post #5 of 8
It's generally suggested to lean more towards positive pressure.. Although I believe it's best to stay neutral.
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post #6 of 8
Quote:
Originally Posted by BlackHoleSon;12477306 
Positive. Air blowing on heatsinks > air only being pulled away.


Of course there needs to be some kind of exhaust, but having as much cool, fresh air coming in as possible will provide the best temperatures.

This is actually false. Negative pressure is better for temperatures because the more exhaust points you have, the more the case will have to suck cool air from outside the case into the case through ventilation holes and such.

Positive pressure is better if you want to keep dust out of your case, for obvious reasons. If your case doesn't need to suck in any cool air through ventilation holes because your case already has a lot of intake points, then the only dust going into your case will be through your case fans, and if those fans have dust filters, you won't have much dust at all in the case. But temperatures will be worse.

However, it is always about having intake and exhaust points in the right place. Even with negative pressure, temps can still be crappy if exhaust points are not in the right places.
Edited by Behemoth777 - 2/21/11 at 8:47pm
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post #7 of 8
I have three fans running in and three running out. Intake in the side and front, exhaust in the top and back. My case stays plenty cool, and with a controller lowering the voltage of the fans to around 7-8ish its whisper quiet.
post #8 of 8
Thread Starter 
I've done a little testing sense posting, and I've determined for my set up, have it mostly neutral with a little positive pressure yielded the best results.

Thanks for everyone input
 
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