... 3,big water tank ,45L 4,environmental air cooling fan 5.With CE Portable air cooling fan for factory OFFICE 1, ... and smell, improve the air quality. 3,The advantages of Portable air cooler: FunctionVarious functions of filtering,ventilation, air circulating, cooling, odor- ... ; an infrared remote control function 5,The principle of Portable air cooler: The cooling process works on the principle of ...