"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
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