The electric heaters in ventilation and air conditioning systems are designed for airflow heating. Their housing is made of galvanised sheet metal. The heaters are manufactured in two versions: rectangular duct EK and round duct ЕК-F. The heaters can be produced with a standard three-phase power supply or for low power (monophase) depending on the customer requirements. Each heater is equipped with a thermostat, mounted on the housing, to protect it from overheating. Control is required to ensure the proper operation of the heater.