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At what temperatures does the Fan(s) kick on?

I have a monitoring script to make sure fans are spinning, but would like to exclude times when temperature is too cold for them to turn on.

Anybody know the thresholds for the board/cpu/phy temp that causes fans to enable?

Thanks.

Fans primarily kick on LOW at a board temp of 40C and kick off at 35C

There are some exceptions for the SMART DC switches based on DC power supply sensors.