EC axial high-performance fan Wall ring made of galvanized sheet steel with additional two-layer paint in papyrus white. Protective grille made of powder-coated steel, in accordance with DIN EI ISO 13857. Impeller with high-performance characteristics with profiled blades made of plastic, aerodynamically optimized for the application, dynamically balanced. Energy-saving, speed-controlled EC external rotor motor with protection class IP 44 with maximum efficiency. Maintenance-free and free from radio interference, excellent electromagnetic compatibility (EMC), ball bearings. Integrated electronic temperature monitoring for EC motor and electronics. Continuously controllable via speed potentiometer. Control possible via three-stage switch or continuously via universal control system or electronic differential pressure/temperature controller.