External wall fan, suitable for external wall mounting for ventilation of small and medium-sized rooms of all types, in residential, commercial and industrial areas. Weatherproof housing in a compact design, made of galvanized sheet steel, powder-coated, alpine white. Connection piece according to standard pipe diameter, solid base plate made of plastic also enables installation on uneven surfaces. Bird protection grille on the outlet side and 2 locking slats with spring return. Impeller: Energy-saving radial impeller with backwards curved blades made of high-quality plastic. Dynamically balanced for quiet operation. Drive: Maintenance-free, closed, ball-bearing motor with moisture protection and thermal overload protection in the winding. Power control: Continuously variable using electronic speed controller ESU1/ESA1 (item no.: 0236/0238) or transformer speed controller TSW 1.5 (item no.: 1495). Electrical connection: Flush-mounted from the rear or surface-mounted from the side.