DC centrifugal fans can be classified based on several factors. Firstly, according to the blade structure, there are forward-curved blades, backward-curved blades, and radial blades. Forward-curved blade fans are suitable for applications with relatively low pressure requirements and high air volume, such as general ventilation in small spaces. Backward-curved blade fans, on the other hand, are more efficient and can generate higher pressure, making them ideal for applications that need to overcome significant resistance, like in some industrial processes. Radial blade fans are robust and can handle high-impact airflows, often used in situations where there is a need for strong air ejection or in dusty environments.

Secondly, in terms of motor types, there are brushed DC motors and brushless DC motors. Brushed DC motors are relatively simple and cost-effective, but they have limitations in terms of lifespan and maintenance due to the wear of the brushes. Brushless DC motors, however, offer longer service life, higher efficiency, and more precise speed control. They are becoming increasingly popular in modern applications, especially in high-end equipment and systems that require stable and reliable operation.

Another classification method is based on the size and capacity of the fan. There are small-sized DC centrifugal fans used in electronic devices for cooling, medium-sized ones for ventilation in buildings or vehicles, and large-sized ones for industrial applications such as in factories or power plants. Each size category has its own specific characteristics and application scenarios, meeting the diverse needs of different industries and fields.