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The jet of air travels over the aerofoil shape of the ring, creating local low pressure, thereby pulling air from behind it as it decelerates in a process known as inducement, a property of the Coanda effect. Once the air exits the ring, it forces the air in front and alongside using entrainment. Using this process, a small brushless impeller in the fan's base can power a much larger air outlet without exposing any blades. The impeller in the base doesn't actually have blades, but rather vanes.