Shaft fan in radial design, directly driven, for installation on vertical shafts and long pipes., Housing made of break-proof plastic with rear air outlet nozzle (can be inserted into pipes with a nominal width of 100), automatic return air shut-off flap built into the outlet nozzle. Two speeds can be selected using an internal switch., High-performance radial impeller with backward-curved blades made of plastic. Vibration-free operation due to dynamic balancing in accordance with quality level G 6.3 VDI 2060 and DIN ISO 1940., AC capacitor motor, closed design, directly driven, maintenance-free, with thermal overload protection, low-noise bearings with long-term lubrication.