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2. List of Dyson products - Wikipedia

   en.wikipedia.org/wiki/List_of_Dyson_products

   The Dyson "Air Multiplier" was announced in October 2009 as an electric fan, intended to provide smoother airflow and, having no exposed rotating blades, operating in a safer manner than conventional fans. [39] [40] While it is described as a "bladeless" fan, it has blades inside its base. The fan works by drawing air in through an inlet in the ...

3. Variable pitch fan - Wikipedia

   en.wikipedia.org/wiki/Variable_pitch_fan

   One advantage of the variable fan option is that varying the fan pitch offers the possibility of reversing engine thrust without the need for heavy blocker doors, cascades, etc. The pitch of the fan can be reversed through Feather as with the Turbomeca Astafan. [2] or through Fine Pitch as employed in the Rolls-Royce/SNECMA M45SD-02. [3] [4]

4. Fan (machine) - Wikipedia

   en.wikipedia.org/wiki/Fan_(machine)

   Fans inside audio power amplifiers help to draw heat away from the electrical components. Variable pitch fan: A variable-pitch fan is used to precisely control static pressure within supply ducts. The blades are arranged to rotate upon a control-pitch hub. The fan wheel will spin at a constant speed. The blades follow the control pitch hub.

5. Cool Down Your Space From Above With These Editor-Recommended ...

   www.aol.com/7-best-ceiling-fans-silent-124800690...

   Most average ceiling fans have blades that range between 42 and 48 inches. This size is suitable for areas between 50 and 75 square feet. ... If you want to go with a cheaper model without one ...

6. Computer fan - Wikipedia

   en.wikipedia.org/wiki/Computer_fan

   Axial fans may rotate at speeds of up to around 38,000 rpm for smaller sizes. [23] Fans may be controlled by sensors and circuits that reduce their speed when temperature is not high, leading to quieter operation, longer life, and lower power consumption than fixed-speed fans. Fan lifetimes are usually quoted under the assumption of running at ...

7. Axial fan design - Wikipedia

   en.wikipedia.org/wiki/Axial_fan_design

   Factors which determine the performance of the fan include the number and shape of the blades. Fans have many applications including in wind tunnels and cooling towers. Design parameters include power, flow rate, pressure rise and efficiency. [1] Axial fans generally comprise fewer blades (two to six) than centrifugal fans. Axial fans commonly ...