... secondary contamination 2.HEPA filter 3.Lower noise Motor 4.Air quality sensor Detalis:BrandGreecamyGreecamy ModelAP001-01/02AP002-01/02 Power ... , elegant, durability.German EBM motor ultra-quiet, low energy consumption, air volume is the same motor 4-6 times.Finally, the ... filter is decomposed into water and carbon dioxide, no secondary pollution.It is an internationally ...