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Also, if one is carrying a long and awkward object, one end may inadvertently enter the path of rotation of a ceiling fan's blades, which can cause damage to the fan. Building codes throughout the United States also prohibit industrial ceiling fans from being mounted with the blades closer than 10 feet from the floor for these reasons.
In 1979, Casablanca introduced their Silent-Flex flywheel to replace the milled-aluminum flywheels they had been using prior. The Silent-Flex flywheel was a double-torus made of soft rubber with die-cast zinc reinforcements that acted as a shock absorber to virtually eliminate the transmission of vibration and noise from the fan's motor to the blades.
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Larger diameter fans can move more air than smaller fans at the same speed. A turbulent, high velocity air jet dissipates very quickly. A large column of air, however, "travels" farther than a small one due to the friction between moving air and stationary air, which occurs at the periphery of the moving column.
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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 ...
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