... of negative ion: 100, 000, 000/cm3 4. Purifying rate: 99.97% Air Purifier 1. Rated Voltage: AC 220V/5A 50Hz; 2 ... of negative ion: 100, 000, 000/cm3; 4. Purifying rate: 99.97% Air Ionizer Parameter: 1. Rated Voltage: AC 220V/5A 50Hz ... of negative ion: 100, 000, 000/cm3; 4. Purifying rate: 99.97%; 5. Applying space: 50-60m3; 6. Certificate: CE; Function: 1 ...