PSU Fan, Inside or outside the case

[mixalhs59]

Hallo! I would like to ask you "Should i place my power suply with the fan taking air from the inside of the case, or should it take the air from the bottom (out) so it doesnt affect the inside of the case?

*Consider that i Have two 120mm Fans at the top of my case pulling air inside.
*Consider that i have one 140mm Fan pulling air outside of the case. At the back of the case.
*And the GPUs fan also

Would the air pressure be fine? Thank's a lot!

 

[Nine Layer Nige]

Traditionally, air flow is front to back, bottom up where the PSU "was" fitted at the top of the case so expelling host case air out the back was important.
However, most modern cases seem to have the PSU at the bottom these days where the air is coolest as heat rises.
The big 120mm fan on the big face of the PSU is fitted to draw air into the psu and push it out the back.
Unless your PSU has some kind of easy fan swap options (that do not void warranty if removed, replaced), the fans will be in fixed direction so you have no choice but to fit it where it fits, which is to push air out the back.
I must add that I am not a PSU evolutionary expert, this is just my general understanding.

 

[Zerk2012]

If your case has the vented slot for the PSU in the bottom of the case then the PSU should be facing fan down to draw in fresh unheated air.
What case do you have?
Basic fan setup is front, side, bottom intake, top, back exhaust.

 

[mixalhs59]

Traditionally, air flow is front to back, bottom up where the PSU "was" fitted at the top of the case so expelling host case air out the back was important.
However, most modern cases seem to have the PSU at the bottom these days where the air is coolest as heat rises.
The big 120mm fan on the big face of the PSU is fitted to draw air into the psu and push it out the back.
Unless your PSU has some kind of easy fan swap options (that do not void warranty if removed, replaced), the fans will be in fixed direction so you have no choice but to fit it where it fits, which is to push air out the back.
I must add that I am not a PSU evolutionary expert, this is just my general understanding.

Hmm

 

[mixalhs59]

Zerk, sry for the "down vote" my phones mistake.

The psu can be placed on the botton of the case.

I just think that the front fan is uselless cuz its only cooling my harddrives. There are 2 "walls"(of the Harddrives) for the air to get through until it gets to the centre

 

[mixalhs59]

So i can remove the 140mm front fan and put it back. So i can have 2 fan on top inserting air, the back 140mm as exhaust and the psu fan as exhaust too(psu at the bottom,with fan inside)
Will this be a good idea?

 

[Nine Layer Nige]

No, the PSU fan should suck in air from the vent underneath the case base. Your case should have a vent in the bottom for the PSU fan to sit on. Remember heat goes UP.
Your case fan(s) on the top should blow air OUT, not suck air in. Leave the front fan in place as spinning disks (hard drives) get hot and can shorten their life if not sufficiently cold.
Air flow should be in from the front and bottom, out at the back and top.