VŽD100 - is equipped with a time delay (TIMER), a diode (for signaling the fan operation) and a terminal block for connecting the power supply. It can work with a light switch (switching off the light triggers the time system). The fan is switched off by an electronic time system with an adjustable delay (from 3 to 30 minutes) after the lighting is switched off. The delay of the fan switch-off time can be continuously regulated by a potentiometer.