Phil Seakins <pseakins@AKAMAIL.COM> wrote:
> But, because IBM put the fan in backwards when they released the first PC
> in the 80's, every clone vendor ever since has copied this error.

You've made that statement twice now. Perhaps from the point of view of
dust management, this choice was an "error", but from a thermal point of
view, it's exactly the right choice. You want the coolest available air
circulating over your motherboard and CPU; you don't want to preheat it
by running it through the power supply first!

The best configuration is to have both intake and exhaust fans, with
filters over the intake fans to catch the dust, and enough excess capacity
in the intake fans so that the net box pressure is positive relative to
ambient, even as the filters begin to load up. The exhaust fans are
arranged so as to draw the air through the hottest areas (e.g., power
supply) last.

-- Dave Tweed

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu