why ceiling fan rotates in anticlockwise direction when viewed from underneath?

Question

na

Answer 1

Do you want cooling effect or warm?
Pl. read:

Standard ceiling fan controls usually include one for speed (high, medium, low, and off), one for the light (on and off), and one for directional control of the fan blades (clockwise and counterclockwise). These vary depending on the make, model, and age of the fan; computerized and remote-controlled ceiling fans are becoming very popular as the technology becomes regularly available.

Ceiling fans are normally used as a cooling device in warm months by pushing air down from above, thereby creating a wind chill effect. In winter months, a ceiling fan can act as a heat transferrer by reversing the direction of the blades. By doing so, the fan pulls air up, thereby pushing the warmer air that stratifies near the ceiling down along the walls; as long as the fan is set at a low speed, this will not create a wind chill. A fan on reverse has the leading edge of the fan blades being the downward edge; in most cases this rotation is clockwise when the operator is standing below and looking upwards at the fan.

Actually it is not that simple. If you have a standard ceiling height (~8 feet) then you want to run the fan in the clockwise direction during the winter. Specifically, the ceiling fan blades should be running with the lower edge of the blade being the leading edge into the air. Having the leading edge of the fan blade down will pull the air in the room upward which pushes the warm air hovering near ceiling outward and forces it to mix with the rest of the air without creating much turbulence or breeze. Although it is a common sense explanation to run the fan in the opposite (counter clockwise) direction pushing the warm air down as a direct force, this also creates a breeze in the room (giving an undesired ‘cooling’ effect) and is therefore not effective for standard ceiling heights.

For high ceilings (greater than 8 feet) you want to run the fan in the counterclockwise direction during the winter. Specifically, the ceiling fan blades should be running with the upper edge of the blade being the leading edge into the air. Having the leading edge of the fan blade up will push the air near the ceiling downward into the room. The breeze created by operating the fan in this direction will be undetectable at low speeds since the fan height is tall enough that the breeze has dissipated before reaching the room height where people would notice.

Answer 2

Fan Rotation Direction

Answer 3

Some of them are made with a switch you can turn them either way.

By flipping the switch it will push air down(summer time), in winter you flip it and it will push the air up.

If up look at the blades they are bend a little it is call pitched, this is what helps air move, if they were straight they will not move the air.

So it is the way the pitch is, plus the way it is rotating that combination gives you the direction of air. This is true of the table fan also. If it does not have reversing switch then by going on the other side you will see that it is turning in the opposite direction.

Experiment:

Take a tissue paper, draw an arc free hand, put an arrow on it, flip the paper the arrow points on the opposite side, you can play this game with some friends, see their reaction.

Let friend stand on the other side and ask him about the arrow,which way it is , then you say, no it is the other way , then tell him or her to come on your side ,and let the person see for them-self. Then explain the trick.

Answer 4

If you look closely at the blades they are tilted. If you want air forced downward (usually in the summertime) the fan is set to go in the direction that the leading edge of the blade is upwards. In cool weather the air should be drawn upward, so the leading edge should tilt downwards. The easiest way to accomplish this change from one to another is by changing the rotation direction of the motor (after stopping it). Another way would be to install the blades backwards, reversing the tilt. Many fans have a switch to reverse the motor. But to answer specifically your question, the direction of rotation is arbitrarily set by the manufacturer, although I believe the fans all rotate anticlockwise when forcing air downward.

Answer 5

Ceiling fans can rotate in either direction! They all have a switch on the side for changing the direction of the motor. One direction pulls air up, and the other direction pushes air down. So if you don't like the way it's turning, CHANGE IT!

Answer 6

Most ceiling fans can now operate in either direction.
In the winter, you may want to displace the warmer air at ceiling level down to room level.

In summer, you may wish to displace the chilled air (from air conditioning systems) off the floor level upwards.

Being able to switch rotations allows you to adjust the comfort level in the room somewhat better than a fixed rotation would provide.

Answer 7

it's the angle of the blade that determines air flow not direction of rotation ,,,Most cieling fans have a little switch by the motor area that reverses the direction of a breeze down on hotter days and upward draft on cold days to blow the heat evenly around the room and off the cieling hot air rises

Answer 8

you can actually set fans to go both ways. We set them to go one way in the summer and the other in the winter. I'm not sure which is which, but one setting will push the warm air down for you in the winter, while the other setting keeps you cool in the summer.

Answer 9

It's just an illusion which depends on the shape of blade and the resolution of your eye.

Answer 10

Fans usually have two settings - counterclockwise and clockwise. It depends on how you want the air to flow......