Fan Direction (was: Re: PC floppy cable twists...)

[Chuck Guzis]

On 10/21/2005 at 1:24 PM Mark Tapley wrote:

>	Problem is the designers actually did do _some_ thinking. On 
>its way out the fan in the original configuration, the air went over 
>the logic board(s) first, then the power supply and drives last. 
>Reverse the fan, it's now hot air hitting the logic board. On my 
>system, this caused the SCSI controller to fail occasionally.

I think the older HP Vectras were a good example of how to use a fan--use a
big slow fan separate from the power supply with ducting (I'm sitting in
front of such a system now--a 1GHz P3).  The result is a machine so quiet
that you're not aware that it's powered on.  OTOH, the original IBM PC had
a very loud AC powered fan that left no doubts--and most other
manufacturers have followed suit, even with DC fans and those stupidly
junky heat-sink mounted fans.

I really miss the pre-Compaq HP.

Cheers,
Chuck