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What will happen if all fans are intake?

post #1 of 15
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I'm probably not going to do it but I was just curious what the effects would be. I have 9 120mm fans, 2 in front 1 in the back, 2 on top and 4 on the side.

What would happen if I have them all as intake with no exhaust?

Will my case expand under the pressure and blow up?
    
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post #2 of 15
They will just fight each other and not do much.
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post #3 of 15
the case will simply gather the air and sooner or later it will fly away, that's what you call good air flow
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post #4 of 15
Quote:
Originally Posted by Daris1015 View Post
I

Will my case expand under the pressure and blow up?
Yes, Yes it will.

Quote:
Originally Posted by joemaniaci View Post
They will just fight each other and not do much.
But seriously, Joe hit the nail on the head, they'll all just fight each other. If your gonna run all one orientation of fan, exhausting them all, would be less detrimental
    
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post #5 of 15
Won't blow up, but won't be as effective as a more balanced in/out airflow. It will basically have a higher pressure inside the case than outside, and air will come out any seams and cracks in the case, as well as be rushing out the PSU since that is the only true exhaust. You will asls have poor airflow around the HSF, causing it to run hotter.

Having a slight positive pressure is not too bad (2 front and 4 side as intake, rear and 2 top as exhaust). Slight negative pressure (4 side, back and 2 top as exhaust and 2 front as intake) is OK also, but would not be as good as the slight positive pressure.
Edited by blupupher - 4/1/11 at 3:39pm
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post #6 of 15
I do this for a living, but in homes and not cpu cases. The philosophy is to have equal amounts of intake as you have exhaust. To much exhaust and you create a negative pressure. To much intake and you create a positive pressure. Either of these will create more heat inside your case. You also want your intake air to be low, and your exhaust air to be high. This will move cool air through the case. Cooler air is always at the lowest point. Hot air will naturally rise. If the top of your case doesnt exhaust air it will roll back down to where it can escape. Depending on where that is it could also make your case warmer even if you have equal part exhaust and intake. For every cfm intake you have you should try to get as close to that as possible for cfm exhaust. This can change if you add air filters into the mix. It's imperative that you keep your filters clean or you will create a negative pressure that will work your fans harder. Hope this helps.
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post #7 of 15
I actually have all intake but the pci slot covers are all taken off and back grill is cut off it works really well and I have little dust even in the HAF 922
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post #8 of 15
Doesnt higher pressure mean better dissipation of heat as the particles are more concentrated?

I think though, it you have lots of holes in your case like mine, all intake is fine.
The is what I do and the hot air simply escapes through the holes. Having them all as intake increased the volume of cool air passing through the computer.

If the case has no escape for the air, the air will just build up and the hot air will not be able to escape. Itll be like having no fans at all..
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post #9 of 15
Quote:
Originally Posted by andypc View Post
Doesnt higher pressure mean better dissipation of heat as the particles are more concentrated?
No. It creates what is called boil over, and that's a bad thing.

Quote:
Originally Posted by andypc View Post
I think though, it you have lots of holes in your case like mine, all intake is fine. The is what I do and the hot air simply escapes through the holes. Having them all as intake increased the volume of cool air passing through the computer.
It depends on what the total area of all those small holes are. If that number is higher than the total cfms of your fans then you would be ok. But that also depends on where those holes are. If that number is less than your fan cfm's then you are creating pressure and not moving the hot air out efficiently.

Quote:
Originally Posted by andypc View Post
If the case has no escape for the air, the air will just build up and the hot air will not be able to escape. Itll be like having no fans at all..
Actually it would be worse as the fans will build pressure inside the case and force the hot air into places you are trying to move it out of.
Edited by HootyHoo - 4/1/11 at 9:57pm
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post #10 of 15
It becomes HOT and LOUD!!
I actually did this once on accident not too long ago
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