FreshDry Dehumidifier Air PurifierFeature Dual Protection, Healthier Solution Changeable H13 HEPA Filter to remove 99. 9% of air pollutants and other harmful substances, effectively capturing micro dust less than 0. 3m. Minimise noise and maximise comfort by optimising the refrigeration and air duct systems. This Dehumidifier uses a reciprocating compressor with less vibration, which can effectively reduce noise. Automatically control room humidity in a comfortable range of 45% 55%