There is no factual reason I can cite for the following,
but I was told and have observed that sucking air from or
through causes less dust build-up.
Yes, tunnel or directed air is more efficient...
> You'll get more efficient cooling if you tunnel or otherwise
> direct the needed air. If you also install a air-flow switch,
> you can wire the contact in series with the PTT to protect the
> system from being overheated.
>> When adding a Fan on a PA heatsink, should I be moving new
>> air in blowing it onto the heatsink? Or is cooling more
>> efficient when the fan pulls the heat away from the heatsink?
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