PSU fan orientation (UP/DOWN)

November 8, 2009 at 14:14:58
Specs: Windows XP
http://img12.imageshack.us/img12/85...

How to install this type of PSUs with a fan like that...

Should the fan face up or down?

Thank you in advance...


See More: PSU fan orientation (UP/DOWN)

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#1
November 8, 2009 at 14:33:12
Never installed one, but logically the fan would go down to achieve any cooling benefit at all. If it faced up, it would be tight against the case. Also a give away would be how the printing is on the psu. Why would you put it in upside down, so you couldn't read it.

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#2
November 8, 2009 at 15:03:19
Take notice of the screw holes in your pic...it's only intended to fit one way. Like grashopper said; down.

Skip


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#3
November 8, 2009 at 17:16:22
Well, I still find it confusing since the item photo legend said that the fan is the top side and from an earlier DIT PSU that i had installed i found it to be very awkward to install in a fan facing down position but i did it anyway since i thought the same as you do "logically the fan should be down for cooling effect" also the prints on the unit gets upside down when the fan faces down.

Anyway the DIT 450 PSU did not live long... Just a couple of months or so... And i keep asking myself had i installed it fan facing up would it be working today?!

I find different posts all over the internet that are split on that kind of a PSU whether should it face up or down...

I can not really figure it out! very confusing...

Does anyone have like an official manual for this kind of PSU with a semi exterior fan on how to properly install it?

Thank you

Please note that English is not my native language, So please excuse my faulty English


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Related Solutions

#4
November 8, 2009 at 19:03:23
OK, hot air rises...physical law we can't change. So the fan goes toward the bottom. Air goes in the bottom and out the back. It's an important part of your case cooling.

Look at your pic. The mounting screw hole just above the power cord socket is offset from the corner to match the holes in your case. The other three mounting screw holes are at the corners to match your case.

--o------o

o--------o

Skip


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#5
November 9, 2009 at 06:18:25
But does not the fan actually blows air not suck air?

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#6
November 9, 2009 at 12:16:44
Look at Skip's drawing in response 4. The holes are oriented in such a way that you can't install the PSU the wrong way. If you put it in upside-down, the holes won't line up.

"But does not the fan actually blows air not suck air?"

A fan has to do both - it can't blow if it doesn't suck...lol. Anyhow, it depends on how you wanna look at it. The fan blows into the PSU, it sucks air out of the case.


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#7
November 9, 2009 at 16:53:39
Well based on my experience with the DIT PSU, It can be installed in both of the orientaions and in fact the fan facing down orientation was a bit awkward screws wise and it just did not fit inside of the case like a glove because the fan was bit bumped outside more than the ones in question.

As for the fan, Well the fan did blow air towards "down" the CPU and the GPU direction... And no i did not get the feeling then that it sucked heat out of the case as other PSU with the fan at the back!

I wish if i can dodge this kind of PSU but my options lies between the one in my first post and this more powerful one...

http://img190.imageshack.us/img190/...

Thank you


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#8
November 9, 2009 at 21:12:47
PSUs do NOT introduce air into the case. Their fans do NOT blow downward toward the CPU. The PSU cooling fan draws air from the PC case, into the PSU, then expels it out the rear of the case. I have NEVER seen one that works differently. Try using a tissue to check the airflow.

PSU airflow

"It can be installed in both of the orientaions"

The mounting holes MUST conform to the ATX12V standard. And as I stated in my other response, the screws holes are oriented in such a way that you can't install the PSU wrong. Then again, maybe you're just working with a crappy case?

ATX12V Power Supply Design Guide

BTW, the pics you posted are to 2 different PSUs....one is 500W & the other is 650W. Are you actually using a CoolerMaster unit or are those just for example?


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#9
November 9, 2009 at 22:31:02
I was wondering about the case too. It has to be an AT/ATX, BTX, or cardboard box. I wonder which one it is?

Phoenix76 could answer that one...

Skip


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#10
November 10, 2009 at 01:19:41
My case is ATX
Brand: Dolphin Tower

The pictures are for two PSUs that i intend to buy one of them.

And since i had problem with a previous DIT PSU that had about the same design fan wise so i am a bit worried...

The holes in my case is like wise

o--------o

o--------o

With my previous DIT PSU i had only used 3 to attach the PSU since it was

--o------o

o--------o

Is that going to be a problem?


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#11
November 10, 2009 at 21:38:05
I think that covers it
http://www.formfactors.org/develope...

http://img97.imageshack.us/img97/85...
http://img44.imageshack.us/img44/85...

Still confusing really

Thank you


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#12
November 10, 2009 at 21:44:08
The fan position is downward and its function is to blow air against the Motherboard and CPU

http://img194.imageshack.us/img194/...

Thank you


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#13
November 11, 2009 at 04:49:21
I have rechecked and yes my case is ATX 12V and the screws alignment is like so

--o------o

o--------o

The power supply units that are in question are

http://www.coolermaster.com/product...

or

http://www.coolermaster.com/product...


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#14
November 13, 2009 at 21:51:50
Will you please look at this video

http://www.youtube.com/watch?v=xvCl...

!


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#15
November 13, 2009 at 22:38:08
Okay I am betting I am way off the mark here and if I am I am sorry. I have not yet dealt with one but have heard of some cases where the psu was at the bottom of the case rather than the top. Could it be that this psu is ment for that application?

Likely

I want to go like my grandfather did. Peacefully in his sleep. Not screaming at the top of my lungs like the passengers in his car.

(\__/)
(='.'=)
(")_(")


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#16
November 20, 2009 at 19:26:03
Just wanted to let you know that i bought and installed a Gamma TE-WX 600wt PSU and everything is fine so far...

@ likelystory:

I have searched a lot and my final verdict is this: Everything goes!

On top facing top
On top facing bottom
On bottom facing up
On bottom facing down
Fan blowing air outwards/Fans blowing air inwards

Anything goes...

I just wish i was never born, That is all


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#17
November 25, 2009 at 00:05:48
Very informative and important website:

http://www.heatsink-guide.com/
-Info about cooling
--Should the PS fan in an ATX case exhaust air or blow air in?


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