Axial high-performance fan, cylindrical tube sleeve, flanges on both sides, directly driven. Cylindrical tube made of galvanized sheet steel, enclosing the impeller, flange molded on both sides, hole pattern according to DIN 24155. With external terminal box. Impeller with 7 blades made of thermoplastic. High efficiency, low operating noise. Vibration-free operation due to dynamic balancing according to quality level G 6.3 VDI 2060 and DIN ISO 1940. 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.