Axial high-performance fan, cylindrical tube sleeve, smooth ends, directly driven. Tube sleeve made of galvanized sheet steel, with two reinforcing beads running around the circumference and protective grille made of plastic. 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.