Axial high-performance fan with square mounting plate, inlet nozzle, directly driven. Square mounting plate with molded nozzle made of galvanized sheet steel, double-coated, color papyrus white. Impeller with high-performance characteristics with profiled blades made of plastic, aerodynamically optimized for the application, dynamically balanced. Three-phase squirrel-cage motor, speed controllable by reducing the voltage, thermal contacts, closed design, maintenance-free, sealed, low-noise ball bearings with long-term lubrication.