Mixed-flow design bridging axial and centrifugal fans: higher airflow than centrifugal and higher pressure than axial for the same model size;twisted blades with balance calibration and over-speed testing; streamlined inlet cone with internal guide vanes for stable pressure and uniform airflow distribution. Ventilation, exhaust, and duct boosting for hotels, restaurants, shopping malls, ofice buildings, and gymnasiums, as well as industrial and mining ventilation.