The cabinet style fan box fan mainly has impellers. Composed of casing, imported current collector, flow guide plate, and motor components. The impeller is welded onto the hub using twisted clamping plates with meridian acceleration characteristics. After dynamic balance verification and overspeed test, it has good aerodynamic performance. The casing adopts a cylindrical shape and is connected as a whole with a silencer function fan. The outlet is equipped with liver deflectors, which have good airflow and stable pressure.