Originally Posted by Amigatec
You also mention setting udc to avoid burning the fan. Does that mean that if it is set to 0, the fire from the pit can melt the fan?
No, I do not mean that.
The fan will run above certain voltage, say 5VDC.
If the outlet of Senior is less than 5 VDC, the fan will not run, the electricity power will transfer to heat, and this heat will burn the electric circuit or motor coil. You can take Udc as this "5 VDC"