Is there a way to find out what is the nominal current of this fan and what type of single phase induction motor is used?
If you look at the RPM, you can see that the PU slip of the motor is (3000 - 2650)/3000 = 0.12 at 50 Hz and (3600 - 3100)/3600 = 0.14 at 60 Hz. There is also a graph of current vs. time that indicates the maximum starting current is about 3 three times the running current. That says that the motor is highly resistive and inefficient. It must be a shaded-pole motor.
Since the motor is highly resistive, you can assume that the leakage inductance does not influence the current very much and simply dividing the power by the voltage will provide a reasonable estimate for the operating current.