3. The power supply of the air electric heater should have a voltage equal to that of the electric heater. If the separately provided electric heater is correctly connected to the control circuit, the electric heater can be put into use.

5. The air inlet of the electric air heater should be equipped with a filter to prevent foreign objects from entering the electric heating tube, damaging the tube, and affecting the service life of the electric heater. In addition, the filter should be cleaned regularly. When installing terminal equipment, a space distance of no less than 1m should be reserved for easy maintenance and repair.