As a general rule of thumb, the more blades a fan has, the better the wind delivery. However, other factors such as the design and angle of the fan blade are also important to performance.
The wider the blades, the better the fan will be in moving air when it’s rotating. ”Use your hand to demonstrate this – close up your fingers and move them up and down rapidly, you will feel more ‘breeze’ as compared to doing that with one finger.”
Fan blades positioned at steeper angles (16 to 26 degrees) will also move a larger amount of air, but they also require more powerful motors to reach a high speed.
So a two-blade fan, such as the EuropAce ESF 6161T, can perform well in terms of wind delivery, as a result of its wider than usual blades and angle of pitch.