... purifier ionizerCold catalyst,Anion,numeralAutomatic,Silent type ,Multifunction Voltage:ac220V±10%/50HZPower:18W Ozone Output: 400mg/h Anion Output: 4million/cm3 ... in sports clubs, meeting rooms, offices, classrooms, theatres, hospital wards, hotel guest rooms, apartment stores, etc., for bacteria & viruses killing, and ... than 99%. ozone generator air purifier for household and hotel used in 2012