Abstract: Separation device comprising a swirler of a sheet material comprising a plurality of vanes (4) with a flow entrance side edge (6) defining an entrance angle (?) and a flow exit side edge (8) defining an exit angle (?). The flow entrance side edge and flow exit side edge extend from a center section (3) to a peripheral edge (9), which extends between end points of the flow entrance edge and the flow exit edge. The entrance angle is larger than the exit angle.

Abstract: Separation device comprising a swirler (1, 20, 30) of a sheet material comprising a plurality of vanes (4) with a flow entrance side edge (6) defining an entrance angle (?) and a flow exit side edge (8) defining an exit angle (?). The flow entrance side edge and flow exit side edge extend from a center section (3) to a peripheral edge (9), which extends between end points of the flow entrance edge and the flow exit edge. The entrance angle is larger than the exit angle. The swirler can me made from a blank (10) by cutting out cutting lines defining the peripheral edges, the flow entrance edges and flow exit edges of a plurality of vanes (4) of a swirler. The vanes are subsequently bent to define the exit and entrance angles. Optionally, the swirler can be stacked with one or more correspondingly cut and bent swirlers to form a single stacked swirler (20, 30).