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Case Airflow: Positive or Negative Pressure?

ProfessorShroom
By ProfessorShroom
in Cooling
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Posted

So I was wondering what you guys prefer, positive or negative pressue? I have a Define R5 with 2 140mm intakes at the front with 2 120mm exhausts on the top (on my radiator) and then I have 1 140mm intake on the rear to make the airflow positive in my case but I was wondering if I should maybe make it an exhaust to aid the natural airflow to the rear of the case? All LTT Noctua fans!

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My first setup had negative air pressure and I had to clean dust out of it like a madman (given it was on the floor, but even my current computer is in the same spot).  With positive air pressure I put this computer together maybe a little over half a year ago and it's nearly dustfree, even the swiss cheese that Antec proposes as a solution to the dust filter in my case never gets dirty.

"You should look up common sense and add it to your vocabulary." - dougdangger 2015

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Positive so you don't have to dust your case every 5 days.

I have experience with having to do this: it sucks. Literally.

1 200mm intake, GPU intake, 3X 120mm exhaust.

Project White Lightning (My ITX Gaming PC): Core i5-4690K | CRYORIG H5 Ultimate | ASUS Maximus VII Impact | HyperX Savage 2x8GB DDR3 | Samsung 850 EVO 250GB | WD Black 1TB | Sapphire RX 480 8GB NITRO+ OC | Phanteks Enthoo EVOLV ITX | Corsair AX760 | LG 29UM67 | CM Storm Quickfire Ultimate | Logitech G502 Proteus Spectrum | HyperX Cloud II | Logitech Z333

Benchmark Results: 3DMark Firestrike: 10,528 | SteamVR VR Ready (avg. quality 7.1) | VRMark 7,004 (VR Ready)

 

Other systems I've built:

Core i3-6100 | CM Hyper 212 EVO | MSI H110M ECO | Corsair Vengeance LPX 1x8GB DDR4  | ADATA SP550 120GB | Seagate 500GB | EVGA ACX 2.0 GTX 1050 Ti | Fractal Design Core 1500 | Corsair CX450M

Core i5-4590 | Intel Stock Cooler | Gigabyte GA-H97N-WIFI | HyperX Savage 2x4GB DDR3 | Seagate 500GB | Intel Integrated HD Graphics | Fractal Design Arc Mini R2 | be quiet! Pure Power L8 350W

 

I am not a professional. I am not an expert. I am just a smartass. Don't try and blame me if you break something when acting upon my advice.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

...why are you still reading this?

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  • Author

I'm just concerned that the rear 140mm fan should be an exhaust, I wonder if switching the top 120mm fans to intakes and only having 1 exhaust would be an issue.

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Posted

That is a perfect idea, you should always have a bit more intake than exhaust.

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