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Exhaust fan only??

D

daphoking

n00b
Joined
Mar 12, 2006
Messages
16
There is a pleathora of different opinions about what the best configuration for pc case airflow is. The general rule I've used is intake in the front, exhaust in the back. But I've read on endpcnoise.com that exhaust fan only will cool better and produce less sound (link). Is this a worthy idea?

The only problem I see is that all negative pressure will cause more dust, but I have a filter in the front inlet of the case.

Opinions? I'm looking for a near silent case.
 
As long as the case you're using is TAC-certified, you should only need the exhaust fan supplied - I have an Antec SLK3000B with TAC (Thermally Advantaged Chassis) certification, and the one exhaust fan is fine for cooling. The only other fans are the stock cooler on a dual-core Opteron 170 overclocked from 2.0 > 2.7G, the PSU fan (Enermax 620W) and the stock fans on two X1900s. This lot generates a lot of heat, but the case is well-designed to cope with it.
 
Less sound? Yes, due to the sound having a less direct path to your ear. Will it flow more air? Not unless the laws of physics change in your case (which many people seem to think happens). Several factors are intertwined here - pressure differential, mass airflow, power, and rpm. THEORETICALLY, balancing the fans so there is equal mass airflow through the intake and exhaust fans (neutral pressure in the case) will result in the greatest mass airflow. Otherwise one fan or the other is reducing its mass flow to create a pressure differential. In reality, the pressure differentials in low noise systems are pretty low and make differences fairly negligable. I don't buy the claim that "airflow from an exhaust fan is much greater than that which is produced from an intake fan", it may just feel like there is more airflow at the exhaust of a fan than the intake because, after all, energy has been added to the air and it has been speeded up.
 
I have no idea if my lian li pc-7 plus is TAC case.

I've been priming it to heat it up and it seems that the system cool much slower than when I had an inlet fan installed. Interesting.. Like the physics lesson, there is no or very little heat exchange.
 
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