Features Specifications:Round HEPA Air Filter,HEPA filter, cabin air filter  The filters are designed to be economical with large capacity of air flowing and  low resistance; good air permeability and high degree of keeping out of dust. 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. We can provide OEM service for all kinds of our such filters.