Very quiet axial fan.
Switch that allows to regulate the ventilation and heating of the appliances (only ventilation; ventilation and resistance at medium power; ventilation and resistance at maximum power).
Thermostat that allows to maintain the desired temperature of the premises.
Rear switch that allows selecting that the thermostat acts on the resistance fan, or only on the resistance (the fan works permanently).
Contactor
Thermal protector.
Manual reset button (RESET).