Ludaz

Looks nice to me!

apollouser

As far as i know having a lttle bit a negative pressure ( a small amount) can help out especially when you dont want extras intake fans making excess noise.

Krunk_Kracker

Hmmmm....well, from numerous articles and research on the net (as well as personal experience), I've found that a nuetral set-up, or slightly positive setup is the best. I've done this on 3 different computers and all had the best results with the neutral set-up.

Let me say, this FAQ wasn't written to really say which IS better, even though I stated what I felt was better, but just to inform those who don't know the differences :D

Thanks for all the remarks!

Mjolnir

With a neutral or positive pressure system you have a better "turnover" of the air in your case. The placement of fans is important, so don't create a short-circuiting route where cool air enters and then immediately leaves the case before doing any good; or vice-versa, where hot air being vented gets pulled right back in.

Also, a bit of a positive pressure will help slow the accumulation of dust.

Krunk_Kracker

Yessir, a bit of positive pressure does help with slowing down dust build-up.

Yes, the best placement for fans are the farthest away from each other. Meaning something like directly in front of the case (intake) and directly at the rear (exhaust) although this FAQ doesn't really focus on fan placement :D

jrabb1920

Very good in detail and facts for basic air cooling setups.

kagaos

A good way to test if you have positive, negative, or neutral pressure (if you don't know you fan's CFM ratings) is by finding a small hole on the bottom (well just not top, or by a fan) of you case, or just slit, w/e (for negative), then you put a sticky note over the hole, if one end of the note is being pulled up, then you have negative pressure. For positive pressure, find a hole, slit, w/e on the side or top of case (just not bottom, or by fans, meaning not right next to a fan..simply use common sense :thumb: ), and do the same thing. If it is being blowed out, or you feel air blowing out, then you have positive pressure. If you tried all of this, and nothing happened, then congrats you have neutral pressure! :)

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Krunk_Kracker

Very good advice. I think for that to work the best though, you would want to test it some where on the case farthest from any fans as possible to eliminate any turbulance that might mess ya up a bit :)

REP for you kagaos

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maddrfookenstein

good post. pressure is wierd stuff (boyle)
just remember that pos-neg pressure don't mean a fan blowing on the cpu/gpu...that's just air, and technically I guess, if there's any moisture at all, which there is, a refrigeration effect.
pos/neg would address the difference between the ambient and the case/gpu/cpu/psu temps. Sometimes either is better depending upon the time of the day in a hot climate.
Positive pressure is good for keeping less dirt from getting in--and evac (neg) airflow--not necessarly case pressure, Away from (CPU/mem/GPU) is always good.
two different same things. Both important. Case temp affects all components. Evac best. Amount of "air" over a component very important too--and it often depends upon your method of heat dissipation whether toward or away-from is the best airflow.

[what's the difference between a duck? One of its feet are both the same.]

noxious89123

Err.. how do you guys get positive pressure = less dust?

Think about it... If you have positive pressure, you must have more intake than exhaust. More intake = more dust.

So IMO no matter what type of internal pressure you have, dust acumalation will be the same

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