High efficiency air filter for air purifier part 1. ISO, RoHS, SGS 2. high efficiency, ... HEPA filters. It has the function to purify and absorb the odor substances, for example, ammonia, fluorine, formaldehyde, methanthiol, hydrogen sulfide ... toxic, harmless, no sensitive reaction. Application:1). Central air conditioner, air HFPA purifier, air cleaner, Fragrance machine etc.2). Medical nano silver ...