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Positive Air Flow ?

post #1 of 7
Thread Starter 
I have read on this forum some where from a user saying if you have a radiator on top in taking air & front fan or fans also in taking air and have NO fan on the back of the pc case let the air out by itself this is positive air flow ? I mean is this right and the best way to let air out a bit like in the picture below


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post #2 of 7
As long as you have more fans pulling more air inside the case than fans letting the air outside. no matter the position of the fans, that is possitive pressure, so the diagram does that.

Possitive flow is a different matter. Personally i don't understand it much so i cannot give a coherent answer tongue.gif

Just be sure to add some filters on the intakes, will make the case cleaning a LOT easier.

I'd post this thread in the Air Cooling section though. Will catch a lot more eyes there, even if you're watercooling.
Edited by Starbomba - 5/27/12 at 12:57am
   
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by Starbomba View Post

As long as you have more fans pulling more air inside the case than fans letting the air outside. no matter the position of the fans, that is possitive pressure, so the diagram does that.
Possitive flow is a different matter. Personally i don't understand it much so i cannot give a coherent answer tongue.gif
Just be sure to add some filters on the intakes, will make the case cleaning a LOT easier.

But is it better to let the air out from the back with no out take fan? because that's the only way it will be going out from or maybe the bottom if you don't have in take fans on the bottom
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post #4 of 7
Personally I would have a fan on the back to increase airflow over the motherboard components, you still have positive pressure as its 4 in versus 1 out.
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post #5 of 7
Quote:
Originally Posted by shadowman007 View Post

But is it better to let the air out from the back with no out take fan? because that's the only way it will be going out from or maybe the bottom if you don't have in take fans on the bottom

I have a very similar setup on my case. Almost the fans (top, bottom, side and front) are intake, and the only exhaust in the back has a fan.

I prefer having a fan to "lead" the air outside the case in an easier way, especially since the top radiator dumps air just above it, creating a flow disturbance and not letting the hot air from the front intake get out.

Also, unless you use a 38mm fan or a high RPM fan as exhaust, the other fans will be able to insert more air anyways.
   
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post #6 of 7
I'd say filter the front and back intakes, and top is exhaust. Still posative pressure, but it guarantees 1-2 degrees above ambient temps in the case which is a good thing. That's what I've done.

The back fan will cool vrms and such, while being exhausted straight away, while the front fans will circulate air through the rest of your case. This causes a slightly negative pressure at the top which draws all air from the bottom upwards, but it creates a positive pressure down on your case.

This will increase total flow and I can guarantee a NOTICEABLE (up to 5 degree) drop in temps if you go this route compared to the one you described in the OP.
    
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post #7 of 7
you wont need a fan on the back, with that diagram the case self-exits any
air out. this is not a good model. why? too much positive pressure does not
allow the heated air out quick enough. the componaents needing cooler air
are not able to get help, due to the air is stagnate. a small positive balance
is what helps internals cool better so that the air is contantly moving (changing).
3-fan in and 3-fans out is neutral (assuming the fans are equal in throughput).
simply turn the rear exhaust to rear intake and the three top fans as exhaust
there small positive.

airdeano
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