Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!aplcen!uunet!camex!circus!kent
From: kent@circus.camex.com (Kent Borg)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Mac temperature, fan, dust.
Message-ID: <1511@camex.COM>
Date: 30 Aug 90 17:54:35 GMT
References: <9013@ur-cc.UUCP> <6910N3w162w@tosh.UUCP> <9053@ur-cc.UUCP> <2125@ux.acs.umn.edu> <8999.26d534ec@rsmas.miami.edu> <2135@ux.acs.umn.edu>
Sender: news@Camex.COM
Reply-To: kent@camex.com (Kent Borg)
Organization: Camex Inc., Boston, MA
Lines: 35

In article <2135@ux.acs.umn.edu> clarson@ux.acs.umn.edu (Chaz Larson) writes:
>In article <8999.26d534ec@rsmas.miami.edu> miller@rsmas.miami.edu writes:

[They both write various reasonable things on whether reversing a fan
on a IIc_ is a good idea.  Sounds like they agree by now.]


Forgive me for tossing fuel on a dying fire, but I have another
consideration: Aerodymanics.

Suck air out of a cluttered box and there are going to be some eddies
and back waters (back airs??), places that don't cool as well as
others.  Reverse the fan, blow air into the same box, and there will
different hot-spots.  Are we sure Apple didn't lay things out with
those hot spots in mind?  (I suspect that miller@rsmas.miami.edu is
right, that the differences are within safe tolerences--but remember
the Plus which ships out of the safe zone.  No room for extra heat in
a Plus!)

Yet another thought, after a year or two of blowing dust through your
computer things are going to become covered with an insulating fuzz of
dust.  This will help keep things warm.  A reversed, filtered, fan
would help this aspect.

A final thought (I promiss): What fails first in these IIc_ machines?
The power supply or something else?  If it is the power supply
reversing the fan might help over-all reliability, if it is the other,
it would hurt.


--
Kent Borg      internet: kent@camex.com    MacNet: kentborg      AOL: kent borg
                                            H:(617) 776-6899  W:(617) 426-3577
"Congress was about to scuttle our defense department ... Could our military 
industrial complex be backing Iraq?"  - my mother, 8-4-90