HEPA air filter media 1.ISO manufacturer 2.SGS, RoHS approval 3.High efficiency, ... fiber glass added catechin, photocatalyst, cold catalyst, active carbon, vitamin C, aromatics, anti-sensitive or catalyzer. It's used in the ... mediaAdopt high efficiency paper filter element, catechin, anti-sensitive, vitamin C, aromatics, active carbon, photocatalyst, cold catalyst, nano silver to make ...