High-pressure tube fan with cylindrical tube sleeve, flanges on both sides, directly driven. Cylindrical tube made of galvanized sheet steel, with flange molded on both sides, hole pattern according to DIN 24155, built-in guide vane. Semi-axial impeller, eight spatially curved blades made of galvanized steel. Vibration-free operation due to dynamic balancing according to quality level G 6.3 VDI 2060 and DIN ISO 1940. Three-phase squirrel-cage motor, two-speed with star-delta connection, closed design, maintenance-free, sealed, low-noise ball bearings with long-term lubrication.