Why do ceiling fans in India have 3 blades whereas in the US and most of the other foreign countries have 4 or 5 blades?

Let’s begin with some interesting topic today. Recently, I was checking some ceiling fan on international e-commerce sites and found fans with 4-5 blades. However, in India, most of the ceiling fans have three blades. Do you ever wonder if the number of blades in a ceiling fan really make any impact? And why do ceiling fans in India have 3 blades whereas in the US and most of the other foreign countries have 4 or 5 blades? People usually think that higher the number of blades, superior will be the air throw, but this is not the case.

Purpose of a ceiling fan in India V/S US, UK, Canada or other cold foreign countries.

Even though India’s weather changes throughout the year, India is a tropical country with most areas having a high temperature. Therefore, the fan plays an important role in keeping the temperature low at home. In India, the ceiling fan is used primarily as a stand-alone home appliance that does not change the actual temperature of the room but produces a perceived cooling effect by forced convection of air in the room.

Typical ceiling fan in India:

Indian Ceiling Fan

Whereas, In the US, Canada or most of the foreign countries, the primary requirement for the ceiling fan is to supplement the air conditioner in summer. They just serve the purpose of keeping the air circulation in the room and are intended to work slowly.

In winter, many of these fans with a reverse switch, can be flipped to turn the direction of the rotation so that it will draw cold air from below so warm air from the heater which is usually located along the walls close to the floor or with vents on the floor can fill the room underneath the fans.

Typical ceiling fan in the US, UK or Canada:

ceiling fans in America

Impact of having Fan with 3 blades V/S having a fan with 4 or 5 blades.

As I mentioned before, having more number of blades doesn’t actually increase the air circulation or cools the temperature. The number of blades increases the fan’s weight. The number of blades will also slow down the fan. More blades chop more air and deliver reduced RPM i.e. round per minute.On the other hand, fewer blades make the fan lighter, assure a smooth operation at a higher speed, deliver good RPM and consume less energy.

Less number of blades assure good balancing, less wind friction and low net pressure ration for a good performance. 2 or 3 blade fan is considered to be the more balanced fan and when a ceiling fan is balanced properly it means that it takes much less power in order to rotate the blades. Less power will help you save up money, too. This makes the fan with three blade ideal for Indian houses.

Three blades turn out to be the optimum number of blades for best air moving performance and efficiency in a ceiling fan’s case. Moreover, many research papers suggest that adding more blades does not improve the performance of a ceiling fan and may actually make it worse by forcing aerodynamic drag on the motor.

Also, Research has proved that the use of a 3 blade ceiling fan will lower the temperature of a room by a minimum of 4 degrees

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  1. Unknown 10th May 2019

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