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From: clarson@ux.acs.umn.edu (Chaz Larson)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Mac temperature, fan, dust.
Message-ID: <2125@ux.acs.umn.edu>
Date: 24 Aug 90 02:37:43 GMT
References: <9013@ur-cc.UUCP> <6910N3w162w@tosh.UUCP> <9053@ur-cc.UUCP>
Reply-To: clarson@ux.acs.umn.edu (Chaz Larson)
Organization: Iron City, USA
Lines: 30

In article <9053@ur-cc.UUCP> carlo@eagle.cvs.rochester.edu (Carlo Tiana) writes:
>In article <6910N3w162w@tosh.UUCP> you write:
>>> So I decided to turn the fan around, so as to have control over where
>>> [...]
>>> Is what I am doing a big no-no?
>>
>>Yes. Return the fan to its original position at once. It was designed to
>>cool the machine. In the configuration you have it in, it is currently
>>heating it.
>
>Now why would that be the case? 

Seems obvious to me.  In the standard configuration, the fan draws outside air
into the front of the computer, pulls it through the interior of the machine,
and exhausts the hot air out the back.

When the fan is reversed, it draws outside air in through the back, blows it 
across the hot power supply [which heats it] and then into the interior of the
machine, very likely increasing the internal temperature.

chaz




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clarson@ux.acs.umn.edu                                       AOL:Crowbone