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From: stevem on 11 May 2010 11:47

"Steven Saunderson" <phelum(a)Syd.au> wrote in message
news:ac2iu5lonoe0rffofntohhj0mm7rqq3nen(a)4ax.com...
> On Mon, 10 May 2010 19:13:39 -0400, OldHobo <OldHobo(a)nilspam.xyz> wrote:
>
>> With that I can agree. I have never seen an ATX power supply that blows
>> air into the case. So perhaps the OP has a unit that was improperly
>> assembled with the fan either mounted backwards or the wires to the fan
>> connector inadvertently switched during assembly of the unit.
>
> Is it safe to reverse the connections on a fan ? I think these fans
> contain electronics and I doubt they would be too happy about polarity
> reversal.
>
> Cheers,
> --
> Steven

Probably would only result in the fan not turning, but I suppose it could
damage the fan. These are "brushless" fans, and essentially they have an
astable multivibrator inside to simulate the pole-switching normally
achieved by the brushes/commutator in a "standard" motor. As such, they are
polarity-conscious; hopefully, there'll at least be a diode to prevent
damage from incorrect connection.

Steve.


From: GMAN on 11 May 2010 13:26
In article <ac2iu5lonoe0rffofntohhj0mm7rqq3nen(a)4ax.com>, Steven Saunderson <phelum(a)Syd.au> wrote:
>On Mon, 10 May 2010 19:13:39 -0400, OldHobo <OldHobo(a)nilspam.xyz> wrote:
>
>> With that I can agree. I have never seen an ATX power supply that blows
>> air into the case. So perhaps the OP has a unit that was improperly
>> assembled with the fan either mounted backwards or the wires to the fan
>> connector inadvertently switched during assembly of the unit.
>
>Is it safe to reverse the connections on a fan ? I think these fans
>contain electronics and I doubt they would be too happy about polarity
>reversal.
>
>Cheers,
Its not the connector or plug that needs to be reversed, The fan just needs to
be turned around so that its exhausting air, not blowing in.

From: GMAN on 11 May 2010 13:28
In article <S-idnRZkReRTnnTWnZ2dnUVZ_rednZ2d(a)supernews.com>, "nobody >" <usenetharvested(a)aol.com> wrote:
>me wrote:
>> On Fri, 07 May 2010 17:27:19 GMT, Winniethepooh(a)100acrewoods.org
>> (GMAN) wrote:
>>
>>> In article <i847u51mln1i5ggn8f913t2e3rl8ltgcbh(a)4ax.com>, me
> <noemail(a)nothere.com> wrote:
>>>> OK... I live in the dark ages... but what's with "modern" power
>>>> supplies blowing INTO the case instead of out of it? Pushing hot air
>>>> in can't possibly be good - why not blow it right out and let the draw
>>>> cool the rest of the case?
>>>>
>>>> Are most of you opening up your PS and reversing these back-asswards
>>>> fans?
>>> I have never known a power supply that was purposely designed to blow air
> in.
>>> Most likey the person in China or wherever the PS was built, accidently
>>> mounted the fan bASSackwards!!!!
>>
>> I dunno... I did some web searching to enhance my knowledge before
>> posting and it seemed somewhat common.
>>
>>
>
>I do remember a fair number of "name brand" ATX computers pulling air in
>and blowing it DOWN thru a special baffle to the CPU (typically PII/III
>and Slot A Athlons) This was fairly decent for colling the CPU in those
>days.
That was different, That was a case fan with a baffle and even then it should
have been drawing air up and away from the cpu.
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