Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!mit-eddie!rutgers!cbmvax!cbmehq!cbmger!peterk
From: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: A2000 internals, Fan, etc...
Message-ID: <442@cbmger.UUCP>
Date: 26 Sep 90 06:26:11 GMT
References: <61050002@hpcljms.HP.COM>
Reply-To: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Organization: Commodore Bueromaschinen GmbH, West Germany
Lines: 22

In article <61050002@hpcljms.HP.COM> brians@hpcljms.HP.COM (Brian Sullivan) writes:
>  [A2000, reverting fan in the power supply]
>  Does anyone know why the fan as shipped pulls 
>the air through the case to the power supply instead of the more obvious method
>of blowing onto the power supply?  I would think the the most heat critical 
>components in the machine would be the power supply, so one would want the 
>maximum amount of fresh cool air blowing though the power supply?  Any ideas?

As engineers told me, the air flow in such a device is very critical.
Other parts suspect to developing big heat are memory expansion boards
and similar stuff (if present). When you now reverse the air flow, you
risk that the parts of the machine at the far end from the power supply
get much lesser air than before. (Notice also the air inlet openings
at the left side of the front, they are accurately calculated.) 
So if your machine doesn't carry too many expansions you might do well
with the reversal, but if it is packed than you shouldn't do that.
In general, air flow is very different from light, it does not take 
the same path on reversal at all.

-- 
Best regards, Dr. Peter Kittel  // E-Mail to  \\  Only my personal opinions... 
Commodore Frankfurt, Germany  \X/ {uunet|pyramid|rutgers}!cbmvax!cbmger!peterk