In addition to standard air cleaners with or without cyclone separators, MAHLE also provides customer-specific air filter elements and air filter housings for passenger cars and commercial vehicles. Air filter elements of various types are used for filtering the intake air. Metal-free filter cartridges with efficient filter media and high dust holding capacity guarantee dust efficiency of up to 99.9 percent. Although cellulose media have predominantly been used for filtration in the past, MAHLE has meanwhile introduced new developments aimed at achieving higher efficiency and dust holding capacities. To this end, multi-layer filter materials made from cellulose, meltblown and nanofibers as well as completely synthetic non-woven materials have already been optimized for mass production.