Drager VS-2 is a one of a kind, 4-stage filter system which allows removing dust and gases from the aspirated air. The first of the 4 stages is when a cyclone dust separator is used with an integrated filter cartridge. Second, the air is then routed through a particle filter and the third stage is when the two pairs up to create active carbon filters. The last and final stage of the filter system is when the carbon filter may have different contaminants, depending on the selection of active carbon filter. Tear gases CN and CS can also be absorbed.