Could Somebody explain Positive Pressure vs Negative Pressure....

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Leadbelly78

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Aug 27, 2014
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Could Somebody explain Positive Pressure vs Negative Pressure anything that might tell me what's the perfect setup. I mean one Person will say something and another will say something else.
I swear, I've been slamming my head against the desk or wall.
 
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You can see the spec of my system in my signature!!
I am using it right now, and it has never overheated or throttled when gaming
The PSU pulls hot air out of the top...
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greens

greens

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Jan 27, 2012
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Positive pressure = more fans acting as intake than exhaust, think about it, they would BLOW into the case, increasing the pressure.

Negative pressure = more fans acting as exhaust than intake, think about it, they would SUCK out the case, decerasing the pressure.

Negative pressure is better for cooling because it eliminates any hot spots, but causes dust issues as the case will be getting air in anyway it can, which usually includes case seams, cracks, and unfiltered openings.

Positive pressure is better for keeping a clean case because you can put a filter on each intake fan, eliminating the dust potential. But this can cause pockets of hot air to form in the PC case.
 
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timeconsumer

timeconsumer

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Nov 28, 2011
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I would argue that each has it's own benefit.

Positive pressure is really good if you're concerned about a lost of dust or if you use a blower style GPU.

Negative pressure is nice because your cooling performance is less limited by the size and position of the intake spots in the case and lessened flow from dirty filters.
 
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profoundnoah

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May 12, 2015
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In layman's terms,
Air pressure refers to the amount of air in a system. The more air in the system, the higher the pressure. More air in the system is provided by intake fans. The less air in the system, the lower the pressure. Positive air pressure occurs when there is more air pressure inside the case than the outside environment. Since air wants to escape, it will blow out of small cracks and crevices in your case, thus preventing dust from accumulating in those areas. Negative air pressure occurs when there is less air pressure in the case than the environment. This causes air to want to enter the case, bringing dust and particles along with it.
 
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lodders

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Nov 2, 2015
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All you need to do is EITHER
1. Blow cold air into the bottom of the case
OR
2. Suck hot air out of the top.

You don't need to do both - there is almost no cooling benefit, but the extra fans cost money and make noise.
I have ONE case fan

If you don't want dust in your case, put a filter over the place where the air comes in. Remember to clean the filter regularly
 
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ahnilated

ahnilated

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Nov 9, 2006
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If you only have one case fan then your system doesn't run very cool or you don't have a very high end system or it would over heat almost instantly unless the one case fan you have is a 12" fan.
 
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Leadbelly78

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Aug 27, 2014
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First then's first. Thank you all.
I just wanted to mention something else. I live in a dust free area. < Thank God >
This is my setup..for now.
I have two fans blowing air into my system, I have two fans blowing air out of the top. I have a exhaust fan at the back, oh yea, have the PSU facing down I don't know if that's correct so I need some help.
 
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lodders

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Nov 2, 2015
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You can see the spec of my system in my signature!!
I am using it right now, and it has never overheated or throttled when gaming
The PSU pulls hot air out of the top of the case, and the 120mm case fan is mounted at the back just below the PSU.
If I had a system like yours, I would add another 120mm case fan extracting from the top of the PC
 
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