Fans are classified into two types: axial and radial, based on the direction of airflow during operation. An axial fan propels air in the same direction as the axis, hence the name. A radial fan, on the other hand, propels air in a direction perpendicular to the axis (radial), hence the name.
Axial fans are further categorized into large, medium, and small models. The appropriate fan should be selected based on the intended application.
Generally, large axial fans are primarily suitable for exhaust in dusty or quarry environments; medium-sized axial fans are mainly used for indoor ventilation and heat dissipation, such as in grain silos; and small axial fans are primarily used for ventilation and heat dissipation in mechanical equipment, such as electrical cabinets.
Because the air pressure in traditional turbine fans is not generated in the central part of the fan but rather through the rotation of the fan blades, no airflow is directed below the shaft, regardless of the fan speed. However, the area below the fan shaft is the core of the heat generation and the main source of heat. This situation creates an inherent flaw in traditional axial fans: airflow is obstructed by the motor, preventing it from reaching the central part of the fan smoothly, creating a "blind spot." The existence of this blind spot leads to higher temperatures in the core of the radiator, affecting overall cooling performance. To solve this problem, centrifugal radial fans were developed.
