This "Which direction should the fan move air in a 9600 case" issue comes up from time to time and there is always confusion caused by Apple's contradictory instructions.
Here is the bottom line. If you have a 9600 you should have the side door fan blowing air INTO the case because the fan at the rear of the power supply exhausts air OUT of the top of the case. Cool air comes in over the components that need it, rises up, and is exhausted out the top of the case.
I, and I think everyone else, realise this. I for one an in no way confused about what my fan should do - it's blowing in and long shall it stay that way. What has me confused is why on this earth Apple decided to shoot the whole thing in the foot by fitting them the wrong way around.
My only theory is that they thought directly exhausting air off the pair of floor mounted hard disks would be better for the cooling of the upper part as it meant that warm air was not being pushed over already hot components further up. There are other places the top exhaust fan can draw air in, but no so as to remain at best cooling efficiency. Has me boggled. Apple have done some crazy things in their time ;-)
-- Mark Benson
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