Device for separating particles for an aerosol stream

The separation device is provided with an impactor (16), which possesses a perforated plate (20) that is flown from the aerosol and approximately parallel to latter running impact plate (22) arranged in direction of flow in the distance behind the perforated tile. The perforated tile and the impact plate are separately manufactured, connected by a connecting element, and are installed in a module as a unit.