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From: siegel@endor.harvard.edu (Rich Siegel)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Fan Controller (low noise) for Mac II/IIx
Message-ID: <2105@husc6.harvard.edu>
Date: 7 Mar 90 03:09:42 GMT
References: <16719@oregon.uoregon.edu> <22746@unix.cis.pitt.edu>
Sender: news@husc6.harvard.edu
Reply-To: siegel@endor.UUCP (Rich Siegel)
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Organization: Symantec Language Products Group
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In article <22746@unix.cis.pitt.edu> quinn@unix.cis.pitt.edu (Clark  Quinn) writes:
>been discussed before (or if it has someone can summarize for me), but
>since I would love to quiet my Mac II down, is the Nova better than the
>Radio Shack 273-243 (or whatever, I have the # at home) fan?  Well,
>yes, of course it's better, but is it better enough to justify the
>price?  My situation is I have a Mac II with Sony PS and only a video 
>card.  My questions are:
>
>Is the RS fan output the same CFM as the Mac II fan and just quieter, or
>is it less but considered adequate?  
>
>Can I replace the Mac II fan with the RS fan easily on my SONY
>powersupply?
>

	A note of caution about the Radio Shack fan: there are TWO part
numbers for this fan: 273-243A and 273-243B. The fans are rated the same in
terms of air volume and current drain, but there is an important
difference between the two: the "A" fan uses ball bearings, and the "B"
fan uses sleeve bearings. The "B" fan tends to get noisier as time
passes, and if you stand the Mac on end (in a stand), the "B" fan will
start to scream.

	Be sure to get the "A" fan. Unfortunately, it's been discontinued,
but if your dealer has old stock, you're in luck. I've bribed my local
Radio Shack store to hang on to any they find.

	Another note: my machine is full of stuff - internal hard drive,
and accelerator, both of which run pretty hot. I supplemented the power
supply's fan with a smaller 2-inch fan which I drive in parallel with the
hard disk. It seems to keep things pretty cool...

R.
~~~~~~~~~~~~~~~
 Rich Siegel
 Staff Software Developer
 Symantec Corporation, Language Products Group
 Internet: siegel@endor.harvard.edu
 UUCP: ..harvard!endor!siegel

"When someone who makes four hundred and fifty dollars an hour wants to
tell you something for free, it's a good idea to listen."

~~~~~~~~~~~~~~~