The blades of the fan are slightly inclined, like the propeller of an airplane. When the fan rotates, these blades push the air to one side. The wiring and design of the motor is such that by default the fan pushes air downwards. In summer we need coolness, so the fan rotates in anticlockwise direction.
In this direction, the blades throw the air straight down, which causes a strong gust of wind and by drying the sweat on the body, a feeling of coolness is felt – this is called wind chill effect. This reduces the room temperature by 4-5 degrees, without running the AC.
Now the question is why not clockwise?
If the fan rotates clockwise, the blades pull air upward and bring down the warm air (which rises) into the room. It is beneficial in winter! In winter, running the fan at low speed in clockwise mode brings down the hot air and makes the room feel warmer.
Electricity is also used less. Fans in hot countries like India are primarily designed for cooling, so their motor and blade angle are designed to push air down in an anticlockwise direction. Most fans have a small switch that changes direction – anticlockwise in summer and clockwise in winter.
If the direction is not correct then there is less air flow or the opposite effect occurs. Some people think that the fan always rotates clockwise, but this is a misconception. When you look from below it appears anti-clockwise, but if viewed from above it may appear clockwise – but the standard is to view from below.
Different fans have different designs
Table fans are different because their motor design is different, they rotate clockwise. The fan rotates not in a clockwise direction but in an anti-clockwise direction so that the air comes down and provides cooling. It completely depends on the wiring of the motor, angle and design of the blade. Most fans are made in such a way that they push air downwards in summer. Next time you switch on the fan, check the direction – running it in the right direction will make the room feel more comfortable!
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