42 White Ceiling Fan With Light

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How was the electric fan invented?
The mechanical fan originated in 1830, an American named James Byron inspired by the structure of clocks and watches, invented a mechanical fan that can be fixed on the ceiling and driven by a spring
How to do if the electric fan is noisy?
Fan leaves may be dirty or deformed, and the center of gravity of the fan leaves is not in the center, which makes it easy to shake and make noise.
What is the principle of a vaneless fan?
The base there is a similar air compressor device, the air is sucked in, after compressed by spraying out annular gap above the ejected air annular air flow driven device, has the wind.
Why does the fan seem to spin backwards when it spins?
Because the human eye to object displacement to distinguish between 0.1s, and 0.1s when the fan turn fast may turn 350 degrees, looks like reversal of 10 degrees, so add up, like upside down
How to measure the speed of an electric fan conveniently and precisely?
If you have a variable frequency light, you can gradually increase the frequency until the first fan page is almost stationary, and then multiply by three to calculate the speed
What is the function of the fan blade?
Five can lookout "cut" more small, quiet is better. Because of the "cut" the wind is more uniform, with five fans not only brought the silencing effect from the comfort of view is also much more choice, fan blowing can achieve a wider range than block adjustment
What is the working principle of an electric fan?
The surface of the body has a lot of sweat, when the electric fan, indoor air flow, so it can promote the rapid evaporation of sweat, combined with evaporation need to absorb a lot of heat, so people will feel cool.
How should an electric fan be used?
When the opening air should not sleep too large, when people sleep, the body circulation slows down, and this is the most vulnerable time for the human body, the human body is too large to air blowing, the human body can cause envy to appear human fatigue symptoms, there will be serious stroke.