1.high efficiency filter element is washable,reusable,cheaper than hepa filter with the same grade 2.G4-H10 efficiency high efficiency filter element is washable,reusable,cheaper than hepa filter with the same grade.  Characteristics:1.high efficiency filter element is designed to be economical with large capacity of air flowing and low resistance; 2.good air permeability and high degree of keeping out of dust.  3.Compared the standards together, the volume of filtering containing dust is 30% more,filtration efficiency is from 80% to 99.9% HEPA grade 99.97% at 0.3um.  4.We canprovide OEM service for all kinds of such high efficiency filter element. Testing Standard: EN 1822-52002             EN779-2003            ASHRAE_52.2-1999