[Elecraft] KPA500 Fan Question

[Bob McGraw K4TAX]

In running my KPA500 on FT-8 mode at about 400 watts output, what is the 
recommended setting for Fan CTL?    I usually keep it in NORmal but have 
tried other settings.  I watch the TEMP and see that it gets above 
65ºC.   The fan speed increments up and down as the temperature changes 
accordingly.  All appears norms.    But, do you find setting the Fan CTL 
to some value is more efficient in regard to cooling?

Thanks in advance for your inputs.

73
Bob, K4TAX