[Elecraft] KPS1500 fan noises

[Roy Koeppe]

"Do the KPA1500 fans push air into the box? If so, why doesn't the KPA500 
fan do that. If the KPA1500 fans pull out of the box why would it be 
appropriate to use an additional fan that opposes this airflow?"

Yes, they do...which is also opposite of airflow in K3s. The idea of the 
additional fans is that they are much more quiet than the built ins, even 
when they are on speed #1 . And they prevent the built ins from running so 
much or not at all. Simpleminded, I admit.

Roy   K6XK