... cut resisitant.4. Complete protection, over-current protection, open phase protection, undervoltage protection,water shortage protection, full ... function.5. Automatic control water-supply system,open type water theif,divide water fluency,automatic clearing ... ,no jam. evaporative air cooler :XK-18S Voltage/frequency: 220V/50HZ~60HZ Air flow ... 18000m3/h standard ventilating device XK-18LF