... ,SGS,RoHS approval 3).non-toxic, harmless Vacuum cleaner air HEPA filter screenHEPA series filter materialAdopt high efficiency paper ... to make HEPA filters. It has the function to purify and absorb the odor substances, for example, ammonia, ... harmless, no sensitive reaction. Application:1). Central air conditioner, air HFPA purifier, air cleaner, Fragrance machine etc.2). Medical nano silver masks, ...