Filter systems are used to clean the extracted air. Depending on the dust characteristics and quantities, various filter media (needle felt, textile, fleece, etc.) as well as various dedusting systems (flush air, compressed air, vibration, etc.) can be used. The output elements (screw conveyors, rotary valves, storage bins) are also adapted to the respective application in a targeted manner. Frequently, the suctioned air can be cleaned efficiently using a properly designed filter system and can then be routed back into the production facility, which saves energy (air return).