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... 

cheers,
skipp 
 
>   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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