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. Single-phase AC capacitor motor, closed design, maintenance-free, with thermal contacts built into the winding, speed controllable by voltage reduction, sealed, low-noise ball bearings with long-term lubrication, reversible.