... SGS,RoHS approval 3).non-toxic, harmless Vacuum cleaner air HEPA filter screenHEPA series filter materialAdopt high efficiency ... paper filter element, catechin, anti-sensitive, vitamin C, aromatics, active carbon, photocatalyst, cold catalyst, nano silver ... :1). Central air conditioner, air HFPA purifier, air cleaner, Fragrance machine etc.2). Medical nano silver masks, exposure ...