How to acheive positive air pressure with my setup, need help

Jared485

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Jan 6, 2013
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I have the Corsair 380t, which only has a 120mm rear exhaust fan, and on the front either: 2 120mm, 1 140mm, 1 200mm fans. I have a itx x99 motherboard with the i7-5820k which is overclocked.

So i got the H100i for the CPU, i have that exhausting in push on the right side of the case.

I currently have the stock front fan (140mm) as intake and the rear 120mm along with the 2 120mm radiator fans all in exhaust. this is creating negative pressure and this case has lots and lots of holes to pull air and dust through.

I've got the gigabyte windforce 980 oc, which doesnt exhaust out the back the heat just disapates which really doesnt help, all that heat is going into the case, all more reason to get more poitive pressure to get cool air in. Even though the GPU intakes from the side by the time it cools the GPU thats just more hot air and doesnt help as an intake.

So im trying to figure out how to create posistive pressure to help temp and dust control.

Im thinking the first step would be to get 2 120mm fans for the front intake. But that still doesnt do it. Once i have those ill have 2 120mm intakes in the front and 3 120mm exhausts at the side and rear, (2 of which are cooling a radiator, so itd be nice to have plenty of cool air in the case to push through those).

So id like to hear what youve all got to say and your reccomendations on how to setup my fans...

 
Solution
using your current setup, I've heard of people flipping one of the exhaust fans on the radiator for their liquid cooling to account for the pressure difference. You could buy 2 - 120mm fans for intake, but not if you get rid of a 140mm.

The 200mm fan is your best option for your front intake, but at the same speed as you'd be running the 2-120s or the 140 at the front. In addition, you'll need to do one of 2 options. The first is to run the rear exhaust at slower speed. The second is to flip the rear exhaust to be an intake.

Either you need to flip the rear, or flip the side, or put a 200mm on front and slow the rear fan.

MasterMace

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Oct 12, 2010
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Positive Pressure cooling is achieved by flipping the fans so they push air in - more than is pushed out, the hot air escapes through the crevices.

Negative Pressure cooling is achieved by flipping the fans so they push air out - more than is pulled in, the cool air is sucked in through the crevices.

Neutral pressure cooling has a nice flow of air from bottom to top, front to back.


You'll find that positive and negative pressure cooling both run much hotter than neutral, as it has comparatively terrible air flow. I don't know how people expect positive pressure to reduce dust build up - dust enters the case from the outside, if air is entering, dust is entering.

The only way I can envision for dust to enter less frequently is to reverse the air flow in your case, where you have the top and rear fans pulling air in and the front fan pushing air out -best scenario is with a glass side where air cannot enter. Dust is typically built up from the ground, as dust falls first and sits before entering the case - this is why your front fans are typically very dirty, but the top not so much.
 

Jared485

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Jan 6, 2013
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When cool air is sucked in throuhg the crevices dust comes with it which i not filtered. Positive pressure will push whatever excess air thats not being exhausted out thos crevices, leaving only dust to enter filtered intakes.

the more cool air being brought in will cool down whatever hot air isnt being forced or sucked out.... If you read my setup im just trying to figure out how to get more cool air in the case
 

MasterMace

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using your current setup, I've heard of people flipping one of the exhaust fans on the radiator for their liquid cooling to account for the pressure difference. You could buy 2 - 120mm fans for intake, but not if you get rid of a 140mm.

The 200mm fan is your best option for your front intake, but at the same speed as you'd be running the 2-120s or the 140 at the front. In addition, you'll need to do one of 2 options. The first is to run the rear exhaust at slower speed. The second is to flip the rear exhaust to be an intake.

Either you need to flip the rear, or flip the side, or put a 200mm on front and slow the rear fan.
 
Solution