... 2).ISO,SGS,RoHS approval 3).non-toxic, harmless Vacuum cleaner air HEPA filter screenHEPA series filter materialAdopt high efficiency paper ... carbon, photocatalyst, cold catalyst, nano silver to make HEPA filters. It has the function to purify and absorb the odor ... Application:1). Central air conditioner, air HFPA purifier, air cleaner, Fragrance machine etc.2). Medical nano silver masks, exposure ...