air purifier 1. Pre-filter, HEPA, Carbon Active, Nano Ion, Vitamin, Cold Catalyst, Ionizer. 2. air ... -function Air Purifier with Nano ion &HEPAmodel no: A381. Pre-filter, HEPA, Carbon Active, Nano silver, Vitamin, Cold Catalyst, Ionizer. 2. Big ... and dust, easy to clean by water.2) High Performance Hepa filter: with anti-bacterial paint.remove small particles and smoking. 3 ...