Msg #282  Type:B  Pour:PC @ALLUSA  Exp:KA9SNF  Date:930415
Subject:Why do fans blow out?
KA9SNF/TPK 1.80 Msg #:282  Date:15-04-93  Time:17:58:59

Fellow Hams,

Why do the fans on PC compatible computers blow
outward?  That makes all the dust come *in* the
disk drive doors and get stuck in the disk drive.

I turned mine around and now it sucks air in,
poviding positive pressure to keep all the dust
out.  I can even put on a filter now like the "big
guys" do.

Any thoughts?

73, Brian, ka9snf @wb7nnf.#spokn.wa.usa

Msg #313  Type:P  Pour:N2MOD @N2BQF  Exp:KA9SNF  Date:930420
Subject:Fan direction!
KA9SNF/TPK 1.80 Msg #:313  Date:20-04-93  Time:18:55:18

Paul,

OOOOoooohhh!  You're the first to give me a sample of other machines.
I'll kick out a new message asking for others' input.  My PC compatibles
always blow air out the power supply.

The PS/2, the IBM 9000, ITT, HP are all into the class I call "better."
It was awareness of these that made me start wondering. Send me a message
in about 2 weeks asking the results of the survey.

Maybe my fan was manufactured backwards.  I'll find out :)

73, Brian

Msg #311  Type:P  Pour:KC4FWC @N7IJI  Exp:KA9SNF  Date:930420
Subject:Re: Why do fans blow out?
KA9SNF/TPK 1.80 Msg #:311  Date:20-04-93  Time:18:39:37

Derek,

Thanks for your thoughts.  A number of people have written back.  I'm
thinking about doing a thermometer experiment at different locations
inside the box.  A few years back, I put a heat sink on any chip that
was too hot to keep my finger on for 10 seconds.

73, Brian

Msg #314  Type:B  Pour:HACK @ALLUS  Exp:KA9SNF  Date:930420
Subject:PC Fan direction survey
KA9SNF/TPK 1.80 Msg #:314  Date:20-04-93  Time:18:57:34

Please send me back a one-line message indicating the type of
computer you have and whether or not the cooling air fan
1) exhausts air or 2) sucks it in.

Thanks, Brian, ka9snf@wb7nnf.#spokn.wa.usa

Msg #407  Type:P  Pour:WA1TRY @W1NRG  Exp:KA9SNF  Date:930427
Subject:Re: As I stated ..
KA9SNF/TPK 1.80 Msg #:407  Date:27-04-93  Time:05:27:34

Rich,

I think I didn't get the previous message.  TPK does a good job of
loggin messages and this one is the only one from wa1try.  No matter;
I have it now!

The second message may have been the SURVEY you saw me initiate.  The
first message was the QUESTION.  Answers varied a lot (with yours in
the majority, though), so I thought I'd ask.  The answers are coming back
about 85% exhaust air and about 15% suck air in.

Complete, compiled results when I get a chance.  Thanks for (wa1)TRYing
again!

73, Brian
