Why do we have to rotate the fans of the propeller in anticlockwise in a vacuum cleaner
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This causes the blades of the table fan that are attached to the armature, to move in clockwise direction. Ceiling fans actually can turn both directions. They were designed this way,turning them one direction pulls the air up, flipping the switch so the blade rotates in the opposite direction pushes the air down.
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When they do, they produce a huge angular momentum, which can make steering difficult. Using two fans pitched in opposite directions allows you to have both fans push air the same direction, and rotate in opposite directions.
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