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How to achieve positive pressure.

post #1 of 7
Thread Starter 
Currently, my build will be an Antec 300 with all 4 fan slots used (no side fan). The 2 rear fans will be stock (probably at low setting) and I will be installing 2 CM 120mm SickleFlow Fans in the front. Also, I will have an EE GTX 460 and a upwards facing SeaSonic M12II PSU. To me, the 4 exhausts and only 2 intakes will create a negative pressure. What would you guys recommend doing to get a positive pressure airflow? I'm considering cutting a bottom hole for a bottom facing PSU mount. Will this isolate the PSU from the system? First time considering airflow.
Lighthouse
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Lighthouse
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post #2 of 7
I actually mount my PSU fan facing down in that same case. For positive pressure, you could set the 140mm and back 120mm to low, and the 2 front 120mm to high. At least thats with the stock antec fans.
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Boinzy
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by Boinz View Post

I actually mount my PSU fan facing down in that same case.

Does it matter which way you have it face if there is no hole on the bottom? I just see it as a exhaust that's hogging up the airflow. Truly tempted to cut a hole in it. rolleyes.gif Is there a simple way to test the type of pressure in the case?
Lighthouse
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Lighthouse
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post #4 of 7
Quote:
Originally Posted by alectrolytes View Post

I'm considering cutting a bottom hole for a bottom facing PSU mount. Will this isolate the PSU from the system? First time considering airflow.

interesting read for you
post #5 of 7
A positive pressure PC case can be achieved in a variety of ways. All you need is more intake flow than exhaust flow. It doesn't need to be much more just a small amount will keep the dust out. You can vary the intake and exhaust fan speeds, sizes and quantities to accomplish this.
post #6 of 7
post #7 of 7
If there's no bottom intake grill beneath the psu you certainly want to face it upwards. I wouldn't consider the psu exhaust, since that fan may not always be running (not sure on the mk). With an externally exhausting gpu you should benefit from positive pressure, as neg pressure may bring some of that exhaust back in. Best thing to do is experiment with fan speeds and placement. Get creative; every case/setup has its own dynamic and sometimes unconventional thinking can pay off.
    
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