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