Blowing air onto the PA allows you to put a filter on the fan input to catch 
dust and dirt.  Doing the reverse pulls unfiltered air into the PA and you can 
get a big pileup of junk on the PA. (Including and occasion bug or two).

Joe

---- "Daron J. Wilson" <[EMAIL PROTECTED]> wrote: 
> OK, this sounds like a simple question, but I can see advantages to both
> solutions.
> 
> 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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