[Elecraft] KPA1500 fan speeds and fan noise

[ANDY DURBIN]

>From the KPA500 kit build manual:

"If airflow arrows are visible on the fan housing, they will show that air will be blown out of the back of the KPA500."


It was a bit surprising to me that the KPA500 fan airflow is the opposite of natural convective flow but I accepted that was the intended design.  My KPA500 fan does pull air in the top and exhaust it out of the back.


"They are running on a 19-volt supply at a slow but effective cooling speed and are very quiet (drawing air upward)."


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?


73,

Andy k3wyc