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how should i config my fans, have i done it correct?

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umarrehman187

Member
Joined
Aug 31, 2009
i have a 9cm fan at the back of my case which blows air out of the system which is close to my cpu cooloer, therefore the cpu cooler blows hot air and the 9cm fan blows it out,

now ive got a 8 cm fan on the side of the case near the bottom, which blows air in and the graphic card is right under it, is this correct? or should i change this so it blows air out of the system?
 

Ben333

Folding for Team 32!
Joined
Feb 18, 2007
I usually set the rear fan(s) to exhaust and the front ones to blow in. I like to keep negative case pressure, so air is drawn into the vents in the case aswell. If you have your power supply and 90mm fan both blowing air out then you can have the side 80mm fan blow in and still have negative pressure, also fresh air for your graphics card. I'd say keep it the way you have it.
 

x509

Member
Joined
Oct 31, 2009
Location
California
Which is better?

I usually set the rear fan(s) to exhaust and the front ones to blow in. I like to keep negative case pressure, so air is drawn into the vents in the case aswell. If you have your power supply and 90mm fan both blowing air out then you can have the side 80mm fan blow in and still have negative pressure, also fresh air for your graphics card. I'd say keep it the way you have it.

Isn't positive air pressure inside your case supposed to be better?

If you draw air in from the vents, you are going to pull in dust. At least, that's what I've read.
 

Ben333

Folding for Team 32!
Joined
Feb 18, 2007
That is true. Some people keep positive pressure so dust doesn't get sucked into vent holes and around CD drives but I think negative pressure gives better cooling in many cases. Look at almost any OEM computer or electronic device with a fan. (DVRs, game consoles, etc)

If you think about it, if every fan was blowing in then the air inbetween the fans wouldn't get much movement. When all the fans blow out though, or the majority of them it draws air into the case from any opening, bringing in fresh air where the vents are.
 

Bobnova

Senior Member
Joined
May 10, 2009
There is a large debate on positive vs. negative. The reality of the thing is that it really doesn't matter that much.
Mine is positive, i have a single 120mm intake fan.

That setup sounds good to me. Thing is though, the only way to know for your case and your parts is to swap fan directions and locations around to find what works best.
I'm on fan config eleven or so on this case.
 
OP
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umarrehman187

Member
Joined
Aug 31, 2009
i think ill go with ben. becuz psu is blowing hot air out, the case fan at the rear near the cpu cooler which has a fan on it is blowing hot air out,

and 1 8 cm is blowing air in, now i do not know what positive or negative is i jus hope its ok lol
 

Ben333

Folding for Team 32!
Joined
Feb 18, 2007
Positive pressure is when there is more air trying to be blown into the case than out, negative is the opposite. The main diference is that positive trys to force air OUT of vents that don't have fans and negative draws air IN from those vents.
 

Cuiiey

Member
Joined
Sep 1, 2008
Location
Melbourne Australia
I prefer negative only with my case, its kinda impossible! i try to align some fans together so they sort of blow in a line kinda so it moves the air out better with less cutting so more quiet as well :)