... ,SGS,RoHS approval 3).non-toxic, harmless Vacuum cleaner air HEPA filter screenHEPA series filter materialAdopt high efficiency ... to purify and absorb the odor substances, for example, ammonia, fluorine, formaldehyde, methanthiol, hydrogen sulfide etc, but also ... Application:1). Central air conditioner, air HFPA purifier, air cleaner, Fragrance machine etc.2). Medical nano silver masks, exposure ...