The invention relates to a suction unit (1), having a housing (3) which encloses a process chamber (2) and has at least one volume flow inlet (4) and at least one volume flow outlet (5), wherein the housing (3) conducts the volume flow and, to this end, has a helical contour (32) with at least one turn (31), the at least one volume flow inlet (4) is arranged at the upper end of the helical contour (32) such that the volume flow is introduced tangentially and is conducted downwards along the helical contour (32) inside the process chamber (2), and the volume flow outlet (5) is arranged on the helical axis (33) of the helical contour (32), and a filter body (6) is arranged upstream of the volume flow outlet (5) in the interior of the process chamber (2) through which filter body (6) the volume flow is conducted.
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