The powerful fan located on the clean air side filters the dusty air to the extraction units; swarf and coarse particles are diverted by the integrated pre-separator directly into the collection system. Remaining fine dust is filtered out by the fine dust filters of dust class “M”. The AL-KO OPTI JET® filter cleaning system uses compressed air bursts during the extraction process to remove dust adhering to the filters to ensure consistent extraction power. Standard features include a large movable collecting container.