why the blades of a fan move anti-clock wise?

can we change them otherwise.

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  • 1 decade ago
    Favorite Answer

    Many fans have a switch on them somewhere to reverse the direction the blades spin. The idea is that, in the summer, you have the fan set in the "normal" position. This will blow a column of air directly down, creating a breeze in the room and making you feel cool.

    But what if it's the winter? Well, a fan can still be effective, if it's set into "reverse". Now the fan will suck air up and blow it at the ceiling. This helps because hot air rises and cool air sinks. Having a fan in reverse will circulate the air so that it does not settle, but without creating a large breeze in the room.

  • Notice the shapes of the blades; they're curved to where the blades can sweep air moving counterclockwise. You could change the direction it spins but the fan wouldn't work as well. In order to make the fan work (clockwise), you must reshape the blade.

  • Nomadd
    Lv 7
    1 decade ago

    Most of the blades are held on by a nut. If you used a nut with the usual thread the fan would need to go clockwise so it wouldn't unscrew the nut.

  • Anonymous
    1 decade ago

    they move clockwise, but u r probably looking at a moving fan, so it can look anticlockwise. this is because the sample rate of your eyes is less than 2 times the maximum frequency of the fan. it is the same reason y car wheels look like they are going backwards and computer screen flicker on film.

    Source(s): AS Physics at A grade
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  • 1 decade ago

    It depends on the factory, how they made the motor, if you want to change the rotation clock wise, some motors have other connectors to change the rotation, refer to owner's manual.

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