I have been following this thread for awhile, and now realize, that maybe
there is not an industry standard for ATX style cases. The ATX cases that I
have used, do indeed blow air into the case with the power supply fan, as
they are positioned above the CPU, so the air is directed at the CPU. There
are several holes pierced into the backside of the case, for the air to
escape. With this theory, I have installed the secondary fans in the front,
also blowing inward, so as the pressure will force the air out the pierced
holes in the back.

As for the AT style cases the Power supply fans always blow out, So that you
could have a flow through effect, But ATX is not the same.

Steve Wolfe..

>
> Actually the fan on the power supply blows out for a different
> reason.  If the fan blew air into the case then it would pick
> up all the heat from the power supply before it ever got to
> the boards and chips.  So instead of bathing the chips with
> cool air, they would be getting more heat added to the ambient
> air.
>
> I agree with Max's point about the case fan.  The power
> supply fan blows out and the case fan should blow in --
> unless they are mounted very close to each other.
>

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