Computer Fan Yellow Black Red

This is usually done on a special pwm capable pin on the arduino.

Ceiling fan with light flush mount. I think you will need to apply 48 volts to get the fan operating. Simply connect yellow and red to 12v and the fan will run. A pc fans wire colors are pretty consistent with red almost invariably marking the positive and black marking the negative or ground.

Once it is operating i think you will find that the yellow and blue wires are the collector and the emitter of a sensor transistor. Since this product is not meant to be replaced with standard components enermax omitted the pull up resistor on the pwm input. Pwm is basically turning on off power thereby increasing or decreasing the speed of the fan.

1 fan with 2 wires black red 2 fan with 3 wires black red yellow 3 fan with 4 wires black red yellow blue warning never ever mix yellow blue with red fan will die no repair black ground negative red wire is positive 12v 7v 5v fan only need two wires black red to workat full speed yellow sends fan. As others have mentioned i believe you have a 48v fan. The fan you have is considered a pwm pulse width modulation fan.

The three wires on a typical cpu fan is red vcc black vdd yellow sensor hall effect sensor you can control the fan using pwm. This transistor is there to permit the monitoring of the motors speed.