A cyclone is a centrifugal separator in which particles, due to their mass, are pushed to the outer edges as a result of centrifugal force. Incoming air is automatically forced to adopt a fast-revolving spiral movement - the so-called double vortex. This double spiral movement consists of an outer stream, which flows downwards in a spiral, and an innerstream, which flows upwards in a spiral. At the interchange between both streams, air passes from one stream to the other. The particles which are present in the air are forcedto the outer edges and leave the separator via a collection device fitted to the bottom ofthe separator.