... 5.Effective Area: 80m2 High Effect Air purifier with ozone and HEPAPurifierHepa Air PurifierHome Air PurifierOzone,Ion/Negative Ion,HepaFunction1) ... Micro computer control, four-lay filter and over oxygen device, with high level, mid-level and low level wind, timing can be set 1 ... hour, 2 hours,4 hours and 8shours, Four-lay ...