Power supply fan position

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Emad Qidwai

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Feb 25, 2015
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Hello everyone :D
I have the following case :
http://www.enter-world.com/product/computer-cases-brazen-e-ca6a/

Its has one 120mm fan on front that blows air outside.
And a normal 80 mm fan on back that too blows air outside.

I have mounted my psu on top and fan direction downwards.
But im really worried that all the fans(including psu fan) are sucking out air from inside.
So will it create too much pressure for fans? like creating some sort of vaccume/suction inside the cabinet?
Or shall i change the direction of any one fan so that it can blow air into the cabinet?

Also what should be the direction of my psu fan (upwards or downwards)??

I am using i3 6098p and a asus 1050ti phoenix edition
psu : antec BP450S

thanx in advance :)
 
Solution
norseman4
What you have set up is a negative pressure environment. Air will be sucked in from anywhere that it can come from which usually means through non-filtered locations. (Even if there are filters this set-up will bypass them.) You will, probably, not be starving fans for air though what you have described is an inefficient setup with potentially an unexpected air path.

Switching the front fan to an intake will ensure that fresh air is coming an and being forced, through the two exhausts, over the CPU. There will be enough air motion in the rest of the case to provide adequate airflow to the GPU(s) as well.

As for the [PSU] position, if there is a vent on the top of the case, having the fan mounted towards that vent will ensure the coolest...
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norseman4

norseman4

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Mar 8, 2012
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What you have set up is a negative pressure environment. Air will be sucked in from anywhere that it can come from which usually means through non-filtered locations. (Even if there are filters this set-up will bypass them.) You will, probably, not be starving fans for air though what you have described is an inefficient setup with potentially an unexpected air path.

Switching the front fan to an intake will ensure that fresh air is coming an and being forced, through the two exhausts, over the CPU. There will be enough air motion in the rest of the case to provide adequate airflow to the GPU(s) as well.

As for the [PSU] position, if there is a vent on the top of the case, having the fan mounted towards that vent will ensure the coolest air possible in the PSU which many people deem is required. Having the PSU fan act as another case exhaust, IMO, is not really as much of an issue as many believe. (It is actually the original ATX case specification)
 
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Emad Qidwai

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Feb 25, 2015
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thanku for your reply :)
But i dont think so there will be any sort of NEGATIVE PRESSURE inside the cabinet because the left pannel of the cabinet has two open slots for more chasis fans. So fresh air will automatically enter the cabinet form their.
 
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norseman4

norseman4

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Yeah, and that's what is meant by negative pressure. Air comes in from anywhere that it can. If the case has air filters these would be bypassed. (Positive pressure is air being forced out of every little space.) The case with the large opening on the side simply means that the fans you have set up will not be starved for air.

I'd still have the front fan as an intake so there is a known airflow. (Besides, I personally don't like warm air being blown from the front of a case, since that would typically be blowing on me.)
 
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