According to the principle classification, fans can be divided into two categories: AC axial fans and centrifugal fans. These two types of fans have different structures, different working principles, and different operating characteristics.

This AC axial fan has many different characteristics in terms of structural configuration, design method, and internal flow phenomenon, and it is not easy to grasp the fan's low-noise design and internal flow mechanism.

Этот осевой вентилятор переменного тока имеет много различных характеристик с точки зрения структурной конфигурации, метода проектирования и феномена внутреннего потока, и нелегко понять дизайн низкого шума вентилятора и механизм внутреннего потока.

This AC axial fan has many different characteristics in terms of structural configuration, design method, and internal flow phenomenon, and it is not easy to grasp the fan's low-noise design and internal flow mechanism.