Axial high-performance fan with a square mounting plate and inlet nozzle, directly driven. The square mounting plate features a moulded-on nozzle made of galvanised sheet steel, painted twice in papyrus white. The impeller has high-performance characteristics with profiled blades made of plastic, aerodynamically optimised for the application, and dynamically balanced. It includes a three-phase squirrel-cage motor, two-speed with star-delta connection, enclosed design, maintenance-free, sealed, and low-noise ball bearings with long-term lubrication.