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Fan blades are often set at an angle to improve the efficiency of the fan. This design, known as blade pitch or blade angle, helps to move air more effectively by creating a pressure difference between the front and back of the blade as it rotates. When the leading edge of the blade is angled, it allows the fan to push air forward more efficiently, generating greater airflow.

Additionally, the angle of the fan blades can also help to control the direction of airflow. By adjusting the pitch of the blades, the fan can be optimized for specific applications, such as cooling or ventilation, to ensure that air is directed where it is needed most.

Overall, setting fan blades at an angle is a common design technique used to enhance the performance and effectiveness of fans in various applications.