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Positive or Negative air pressure? Looking to reduce dust build up

post #1 of 9
Thread Starter 
I'm going to be using a Define Mini or TJ08B-E case for my next build. The CPU will be cooled using an H50 water cooler.

Should I have more air coming into the case or out of the case to help reduce dust build up inside?
post #2 of 9
In my Cooler Master 690 II Advance, I use positive pressure since I don't have dust filters. On my Fractal Design Core 100 though, I use Negative Pressure since the only intakes are on the front panel and have really nice filters on them.

Both systems have no noticeable dust build-up.
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CHILZ - Lan Rig
(17 items)
 
CANARY - Main Rig
(16 items)
 
CADILLAC - HTPC
(14 items)
 
CPUMotherboardGraphicsRAM
Intel i5-4570s Asus H97M-Plus AMD R9 280 G.Skill RipjawsX 16 GB (2x8) 
Hard DriveHard DriveHard DriveCooling
250 GB Samsung 840 240 GB Kingston 3 TB USB 3.0 Drive Custom Loop 
OSMonitorKeyboardPower
Windows 10 Preview BenQ GL2450 Filco MajesTouch2 Ninja PC P&C Silencer Mk III 600 W 
CaseMouseMouse PadAudio
Fractal Design Core 1000 Mionix Castor Monoprice XXL JL Amps + Custom Morel Bookshelf speakers 
Other
Scythe Kama-Panel 3 
CPUMotherboardGraphicsRAM
FX-8150 @ 4.6 GHz Fatal1ty 990FX Pro 9800 GTX+ 512 MB G.Skill Ripjaws X 1866 CL9 
Hard DriveHard DriveCoolingOS
120 GB OCZ Vertex 3 1 TB WD Black 5x 120mm + MCP350 + EK Supreme HF + MicroRes Windows 8 Consumer Preview 
MonitorKeyboardPowerCase
2x Dell U2212HM Logitech G110 Cooler Master 850W Silent Pro Cooler Master 690 II Adv. 
MouseMouse PadAudio
Razer Death Adder 3.5G Staples Gel Cushion Asus Xonar DG + Senn. PC333D 
CPUMotherboardGraphicsRAM
Q6600 Acer X1800 ATI 5670 2 GB Kingston 
Hard DriveOptical DriveOSMonitor
2 TB WD Green Asus BD-R Windows 7 Home Premium Sony 50" LCD 
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Acer Media 220 W SFF Acer X1800 Acer Optical 
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The TV cabinet Denon 2808 7.1 AVR + Dahlquist 350W 8" Sub + Kl... 
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post #3 of 9
In general, you will want to set up a positive pressure system, so air is forced out of any crack and crevice. That will essentially prevent dust sliding in.

In a negative pressure system, air rushes into every crack end crevice, that will entail dust.

Edit: Fixed typos. Murlocke caught them and eek! biggrin.gif
Edited by Munkypoo7 - 5/10/12 at 10:22am
     
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post #4 of 9
to reduce dust u must to use strong exhaust whit filters in the other grills
post #5 of 9
Quote:
Originally Posted by Munkypoo7 View Post

In general, you wil want to set up a positive pressure system, so air is forced out of any crack and crevice. That will essentially prevent dust sliding in.
In a negative pressure system, sir rushes into every crack end crevice, that will entail dust.

This.
Quote:
Originally Posted by senna89 View Post

to reduce dust u must to use strong exhaust whit filters in the other grills

You got that backwards, you want strong intake with good filters for positive pressure. Having more exhaust than intake results in dust getting pulled through all the little gaps in your case.
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post #6 of 9
Thread Starter 
Got it. I'll just direct all my fans inwards and maybe one fan exhausting out the top. Thanks for the advice!
post #7 of 9
Positive = more air in pushing air out
negative = more out sucking air in

Negative usually gets more dust building because air is coming in from any place able. Do positive and buy dustfilters, Never had a bad day pushing more cool air in anyways. thumb.gif
post #8 of 9
Like what others have said, positive pressure is the way to go.

On a side note though, if you do end up getting the TJ08-E, it's built for positive pressure as it is.
    
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post #9 of 9
Thread Starter 
Thanks for all the replies guys. I've placed my order and in fact went with a different case. The TJ08 really concerned me about my PSU selection and having a Blu-ray player as well. I didn't want all the PSU cables to be shoved up again the drive and the Define Mini I wasn't sure how much air restriction the front cover was going to cause so instead went with the Arc Mini.

Should have all the parts this week. biggrin.gif
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