This filter system is used for the filtration of laser dust. It is modelled as a filter system with one filter unit. Physically, three different filter types are installed: a cartridge filter (CartridgeFilter1), a HEPA storage filter (CartridgeFilter2), and a sorption filter (CartridgeFilter3). In the PAEFS data model, all three filters are represented by the cartridge filter type. Assigned to CartridgeFilter1 are a device for adding filter aids to bind sticky and very fine laser smoke, and a cleaning unit for removing dust from the cartridge filter.