These fan controllers are ideal for controlling single fans and can deal with most fans including large ones.

For manual use simply plug the fan into the controller and use the left hand dial(minimum fan speed) to speed the fan up or down.

By adding the Temperature Sensor(available seperately) the controller becomes automatic. Now we can set the temperature, place the sensor where we want to take the reading and the controller will automatically adjust the fan speed to keep the room at the correct temperature.