How many blades should a fan have
There is a misconception that the more blades a ceiling fan has, the more air it will move, but nothing is further from the truth. In fact, the air movement generated by the fan has more to do with other factors such as the inclination of the blades or their length, and in terms of number, the opposite of what is usually believed would happen: the fewer blades, the more air will move.
In fact, the models with fewer blades are recommended for larger spaces, and those with more blades, to cool more gently.