A motor driver is wasted on a fan. The benefit of a motor driver is that it can drive the motor in either direction. You don't do that with a fan. You can use a simple transistor such as bc337 to drive a fan, you can even control the speed.
Note that if the fan has 3 or 4 wires, you don't need a driver at all because it will already have one built in. You can identify which wire is the speed control wire and connect that directly to an Arduino pwm pin (via 220R for safety) if you want to control speed, or any digital pin for simple on/off.