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.  

  Neil - WA6KLA 

---- Original Message ----
Subject: RE: [Repeater-Builder] Re: Fan cooling on PA
Date: Tue, 28 Mar 2006 15:09:43 -0000

>> 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?
>> Thanks in advance,
>> Daron N7HQR
>As far as cooling efficiency, I think it is better to blow onto,
>rather than pull away from.  Pulling away can tend to produce wimpy,
>un-directed, low velocity air flow.  Blowing onto puts the airflow
>where you want it, with more velocity and <action>.  Plus, as another
>poster points out, you have a way to add filters as needed.
>Laryn K8TVZ

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