The HTFC centrifugal fan case mainly consists of an impeller, a casing, an inlet current collector, guide vanes, and motor components. The impeller is welded to the hub using twisted clamping plates with radial 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.