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A Dyson cyclone works by employing cyclonic separation, which spins air at high speed. Dirt and dust are thrown out of the airflow and collected in the bin, not on a filter or in a bag. 

Cyclone technology works by building on dual cyclone technology. On top of the vacuum chamber, seven funnel-shaped channels were added that force air to travel in higher curvature cyclones than in the initial cyclone, creating higher centrifugal force, allowing smaller particles to be captured before the air is expelled.  The powerful suction spins out larger dirt and debris. The shroud then filters out fluff and dirt. The fast moving air takes the smaller dirt and dust particles into the cones where the dirty air is accelerated to 900 mph (1,400 km/h), spinning at over 324,000 rpm in each cone.[6] Centrifugal forces of 200,000 g are exerted on the tiny particles moving in the 900 mph (1,400 km/h) dirty air inside the cones. The momentum of the particles is so high, that cigarette smoke particles separate from the air at the narrow end of the cones and gather in the container. The use of centrifugal forces rather than fine filters, results in the Dyson maintaining suction, with no influence on the amount of dust that is collected in the container.

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