Cool down a hot room or humidify a dry environment with this industrial 30-litre portable air conditioner fan which adopts the natural process of water evaporation. It is energy-efficient, environmentally friendly and durably built to last. The evaporative air cooler has a large 30-litre water tank which can be filled with regular water or ice water. You can add water manually by opening the lid on top or automatically through the rear inlet. Remember to empty and clean the water tank when not in use to avoid the growth of mould and mildew. The compact air cooler with wheels allows you to transport it indoors or outdoors without much fuss. Adjustable Speed: Three-speed air cooler could meet your different needs and be applied on various occasions. You could enjoy the low speed when you are sleeping and medium speed when relaxing, as well as high speed during the scorching summer months. Cool/Humidify: Adopting ice crystal refrigeration and air humidifying technology, the air cooler can cut down the temperature from the air vent and raise relative humidity, prevent air drying. Deliver Wind at Wide Angle: Swing the blades automatically, deliver wind at horizontal wide angle. Also can swing the blades vertically manually, select the direction discretionarily. Timing Function: The 24-hour timing function ensures the air cooler could stop automatically after you set the performance time. Large-capacity Water Tank and Universal Wheels: 30L large-capacity water tank prevents you from adding water continuously. And you could freely move the air cooler from room to room for its wheels. Best for hot & dry climates: In places where air humidity is low, air cooler brings the temperature down through water evaporation and adds moisture to dry air. SWING: Press once to make vertical louvres swing horizontally which will be displayed by the swing indicator. Press again to fix the air direction. To direct airflow vertically, adjust the horizontal louvres manually. COOL: Press once to start the evaporative cooling function, press again to cancel. TIMER: It can be set between 1 to 24 hours, increased by 1-hour intervals.