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Windows 7: Question from a test

03 Feb 2010   #1

Question from a test

This is a question from an exam for a class I am taking.

"In a properly designed, properly assembles PC case, air flows in a specific path from the power supply fan through the vent holes."

The vent holes being in the back of the case, I said false. I got it wrong. Supposedly some PSU's use their fan to vent on and cool the CPU????? That's what I was told. That I have never seen. Anyone here ever seen this method????

My System SpecsSystem Spec
03 Feb 2010   #2

Windows 7 Ultimate x64

Here is a link, if you read the second paragraph you will see it explains exactly what you are talking about.
Internal Air Flow
My System SpecsSystem Spec
03 Feb 2010   #3


Interesting. Venting the heat from a PSU into the case. None of my computers ever had that!!! My current machine has over 100cfm of air movement and the PSU vents out. I would think with one fan you would vent PSU heat out, not in. But then all my PC's have been desktops not towers. Maybe thats the dfference.
My System SpecsSystem Spec

03 Feb 2010   #4

Windows 8.1 Professional 64-Bit

General rule is that lower fans (front, sides, etc) draw air in, and higher fans (back, top, PSU) draw air out.
My System SpecsSystem Spec
03 Feb 2010   #5

Windows 7 Home Premium 64-bit

Cold/ Room temputure air goes in ------->
<--------- Hot air goes out.
My System SpecsSystem Spec
03 Feb 2010   #6


Cold/ Room temputure air goes in ------->
<--------- Hot air goes out.
No this was a single fan so PSU heat is venting into the case and out the back case vents. that's what he described.
My System SpecsSystem Spec
03 Feb 2010   #7

Windows 7 Ultimate x86-64

Is the PSU mounted on the top or bottom of the case?
My System SpecsSystem Spec
04 Feb 2010   #8


Is the PSU mounted on the top or bottom of the case?
According to his description it is a tower configuration, so I would think it's blowing down over the CPU and MB. In all the PC's I've seen I have never seen that.
My System SpecsSystem Spec
04 Feb 2010   #9
Microsoft MVP

Win 7 Ultimate x64

Quote   Quote: Originally Posted by pparks1 View Post
Here is a link, if you read the second paragraph you will see it explains exactly what you are talking about.
Internal Air Flow
You notice the date on that article,

The PC Guide (Welcome to The PC Guide!)
Site Version: 2.2.0 - Version Date: April 17, 2001
majorly out of date. This is a little better,

ATX - Wikipedia, the free encyclopedia


The original ATX specification called for a power supply to be located near to the CPU with the power supply fan directed to draw in cool air from outside the chassis and exhaust it directly onto the processor. It was thought that in this configuration, cooling of the processor would be achievable without the need of an active heatsink.[1] This recommendation was removed from later specifications and modern ATX power supplies prevailingly exhaust air from the case.

and would be the very reaon that no one has seen a PSU that blows in, they don't exist anymore (or are in a very old computer).

And some more light reading on the subject,

and from page 34,

The ATX Specification allows for numerous (and often confusing) possibilities for power
supply fan location, direction, speed, and venting. The designer’s choice of a power supply
cooling solution depends in part on the targeted end-use system application(s). At a
minimum, the power supply design must ensure its own reliable and safe operation.

Fan location/direction. In general, exhausting air from the system chassis enclosure via a
power supply fan at the rear panel is the preferred, most common, and most widely
applicable system-level airflow solution. Other solutions are permitted, including fans on
the topside of figure 5 and the Wire harness side of figure 4 or 5. Some system/chassis
designers may choose to use other solutions to meet specific system cooling requirements.
My System SpecsSystem Spec
04 Feb 2010   #10

Windows 7 ultimate 64 bit / XP Home sp3

As far as I know ATX or BTX top psu or bottom they both draw air in from the case and blow it out the back. By the way nice post stormy13. Fabe
My System SpecsSystem Spec

 Question from a test

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