1.More blades implies more power required to push through air & due to limited power motor, will effect directly on the speed of fan, hence finally leading to lower air flow in the room.
2.Excessively larger number of blades are also useless as, if a fan is able to sweep the air in its particular area with just 3 wings, the power implied to move the 4th gets wasted.
3. single & double blades also leads to imbalance, also very high velocities are required to work with this kind of fans.
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