Switchable Air Outlets Heating Usage is achievable by switching the Air Outlets direction. Just lift the ducts from both side and switch around, this is one of the unique key selling points of Avolta Portable Aircon. Easy Cleaning If there is a large amount of dust on the net, the air volume will be reduced. If the air filter becomes clogged with dust/dirt, the Air Filter can be Cleaned once every two weeks. It is Very Easy to take off air filter from the strainer overlay at the side. Clean the air filter with neural detergent in lukewarm water(40℃) and dry it up in the shade. Environmental Friendly Refrigerant Avolta Portable Aircon ‘A’ Series uses High Efficiency Compressor uses the R410a Non-Ozone Depletion Refrigerant which is complies with the European directives on the environment. It is Low in Global Warming Potential, because it is a Natural Refrigerant that does Not Affect the Ozone Layer, and if emitted to the environment Does Not Represent Any Harm; furthermore, it has Excellent Cold Transmission Properties. Self-evaporation The Inner Water Tray in the air-conditioner has a Water Level Safety Switches, it controls the water level. The continuous drainage is not need to be applied when the unit working at the Cool or Dehumidify Mode. The unit can Evaporate the Condensate Water Automatically by the splash motor. You can continuous drain the water with a drainage hose(optional) connected to the bottom drain hole, when the unit working at the Fan mode. Otherwise the water tray will full when Water Level reaches an Anticipated Height. For most of the Portable Aircon models, “E4” will be displayed on the LED display to indicate water full. When the water is full, the Compressor will automatically Stop Running to prevent troubles. You can Remove the Rubber Blockage from the Drainage Hole at the bottom of unit, Drain the Excessive Water with drainage pipe.