Medium-pressure tube fan with cylindrical tube sleeve, flanges on both sides, directly driven. Cylindrical tube made of galvanised sheet steel, with flange formed on both sides, hole pattern in accordance with DIN 24155 sheet 3 with integrated guide vane. Axial impeller made of plastic with 14 spatially curved blades. Vibration-free operation thanks to dynamic balancing in accordance with quality level G 6.3 VDI 2060 and DIN ISO 1940. Single-phase AC capacitor motor, enclosed design, maintenance-free, with thermal contacts built into the winding, speed controllable by voltage reduction, sealed, low-noise ball bearings with long-term lubrication, non-reversible.