The core working logic of a fan is based on the fluid motion laws in aerodynamics. Essentially, it drives the fan blades to rotate through mechanical power to achieve the acceleration and directional flow of air. As a key component, the fan blades are usually designed with a specific tilt angle (i.e., "angle of attack"). When the motor drives the blades to rotate at high speed, the surface of the blades exerts thrust on the air: the leading edge of the inclined blades cuts the air and squeezes it in a specific direction, forming a positive pressure area in front of the blades and a negative pressure area behind. According to the continuity equation of fluid mechanics, the negative pressure area continuously sucks in the surrounding static air. After being accelerated by the blades, this air is pushed forward in the form of parallel air flow, forming the "wind" we feel.​

It is worth noting that the number, shape, and material of the fan blades directly affect the air supply effect. For example, three-blade fans have a larger spacing between blades, resulting in less air resistance during rotation, which is suitable for scenarios where large air volume is required; five-blade or seven-blade fans have denser blades, providing more uniform and gentle air supply with relatively lower noise. If the blade material is a lightweight and high-strength material (such as ABS engineering plastic), it can reduce the motor load, improve rotation efficiency, and reduce noise caused by resonance. In addition, the air supply range of the fan is also related to the rotation speed of the blades. The higher the speed, the greater the kinetic energy obtained by the air, and the farther the air supply distance, but it will also consume more electrical energy. In daily use, the "gusts" or "continuous wind" we feel are essentially the result of the combined effect of the rotation frequency of the fan blades and the inertia of air flow. A reasonable blade design can make the air flow more in line with human comfort needs, avoiding discomfort caused by excessive or uneven air flow.