How Do I Create a Negative Pressure Case Setup?

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JordanK_

JordanK_

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Nov 16, 2013
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I was wondering how to create a negative pressure setup for my new computer that I'm currently picking out parts for. I would like to use Noctua NF-A14 PWM's, but I'm not sure about how many fans I should use, and in which case fan slots.

Here's the build I'm going to make:


Case: Corsair Obsidian Series 750D ATX Full Tower Gaming Case
http://www.ncix.ca/products/?affiliateid=7474144&sku=90...


CPU: Intel Core i7-4770K
http://www.ncix.ca/products/?affiliateid=7474144&sku=81...


CPU Cooler: Corsair H100i
http://www.newegg.ca/Product/Product.aspx?Item=N82E1683...


Motherboard: Asus Sabertooth Z87 ATX
http://www.ncix.ca/products/?affiliateid=7474144&sku=84...


RAM: Corsair Vengeance 16GB (2 x 8GB) DDR3-1866
http://www.newegg.ca/Product/Product.aspx?Item=N82E1682...


GPU: Asus GeForce GTX 780 OC DirectCU II
http://www.ncix.ca/products/?affiliateid=7474144&sku=88...


Hard Drive: Seagate Barracuda 500GB 3.5" 7200RPM - SATA 6 GB/s
http://www.ncix.ca/products/?affiliateid=7474144&sku=63...


Solid State Drive: Samsung 840 EVO 250GB 2.5" - SATA 6 GB/s
http://www.ncix.ca/products/?affiliateid=7474144&sku=87...


Disk Drive: LG GH24NSB0 DVD/CD Writer
http://www.ncix.ca/products/?affiliateid=7474144&sku=89...


Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit)
http://www.ncix.ca/products/?affiliateid=7474144&sku=45...


Monitors: Asus VG248QE 144Hz 24.0" Monitor x2
http://www.ncix.ca/products/?affiliateid=7474144&sku=80...


Keyboard: Logitech G710+ Mechanical (Cherry MX Browns) Wired Gaming Keyboard
http://www.ncix.ca/products/?affiliateid=7474144&sku=77...


Mouse: Logitech G400s Wired Optical Mouse
http://www.ncix.ca/products/?affiliateid=7474144&sku=82...


Case Fans: Noctua NF-A14 PWM 82.5 CFM 140mm Fan
http://www.ncix.ca/products/?affiliateid=7474144&sku=82803&vpn=NF-A14%20PWM&manufacture=Noctua

 
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Nuclear101

Nuclear101

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Jun 11, 2012
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Why would you want negative air pressure? It allows dust to get sucked in while positive air pressure prevents dust buildup. I recommend 2x Corsair AF 120 High performance at the front with the HDD cage(s) removed or the stock fans.
 
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JordanK_

JordanK_

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Nov 16, 2013
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Negative case pressure keeps your computer cooler than positive case pressure. Its mostly personal preference though.
 
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airplanegeek

airplanegeek

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Dec 24, 2012
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all you need to do is have more fans pulling out than in or higher speed out than in
 
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Pinhedd

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Aug 7, 2007
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/nitpick on

On these forums we obey the laws of physics!

It is physically impossible to create negative pressure. The lowest possible pressure relative to anything is that of an absolute vacuum.

Surely you mean to create a negative pressure gradient such that the pressure inside the chassis is lower than that of the ambient environment! The relative ratio between the two will be less than one, but still positive.

/nitpick off

Anyway, it's purely a matter of personal preference.

A high chassis pressure is nice for water-cooled machines, but that's about it. The difference is all around negligible. Airflow is far more important in an air cooled machine.
 
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