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First of all thank you both very much (+1 BOTH!), special thanks goes to BradtheRad for the schematic drawing (even tho I'm not yet familiar with all the symbols nor the term "100K impedance", nor do I understand how a 10K resistor can provide variable voltage)
The 10K component is a potentiometer. Same as a volume control. I believe your schematic has one with a value of 50K.
Input impedance' is a spec which gives some idea what amount of current is drawn by the control terminal on the fan.