I tried, it does not work on the B3. Both fans still at max speed.
Tried this:
"bitmain-fan-ctrl" : true,
"bitmain-fan-pwm" : "50"
and
"bitmain-fan-ctrl" : true,
"bitmain-fan-pwm" : "50",
I thought a comma , was missing behind the "50" but no change ...
Guys, All I did was just remove the connector of the Exhaust fan. My chips temperature is at 35 degree and I still feel cold air coming out through the exhaust fan(I did not unmounted the fan from Miner) one fan is enough and the Noise is almost 50% less and I am happy that no disturbance from miner