1.shable 2.reusable 3.cheaper than hepa filter with the same grade 4.G4-H10 efficiency High efficiency micron filters are designed to be economical with large capacity of air flowing and low resistance.  Description:1.good air permeability and high degree of keeping out of dust. 2.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. 3.We can provide OEM service for all kinds of such high efficiency micron filters. Testing Standard: EN 1822-52002             EN779-2003            ASHRAE_52.2-1999