Air multiplier fan
An air multiplier fans blow air from an oval opening without exposed blades, the vanes are hidden within the frame. Air movement is created within the frame, directed and focussed to the central void (or toroid), to create the cooling effect through air flow. Unlike an axial fan, which creates intermittent air flow, pressure and some noise as the blades turn, an air multiplier fan separates the blades from the air flow thus creating a continual constant air flow and less noise. It is also called a bladeless air fan.
The first patent for a bladeless desk fan is recorded as being by the Japanese firm Tokyo Shibaura Electric in 1981 (now known as Toshiba). In 2009 James Dyson, improved on the original design by benefitting from what is known as the Coanda effect, where air tends to flows along the curvature of a surface rather than separating from it, this was named and patented as the air-multiplier bladeless fan.
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