Horizontally discharging EC roof fan with efficiency-optimized aluminum housing and newly developed high-performance radial impeller. Housing made of seawater-resistant aluminum with integrated protection against interference. Motor support plate and base plate with inlet nozzle made of galvanized steel. Base plate with threaded screws for attaching suction-side accessories (hole pattern according to DIN 24155, sheet 3). Protective grille as standard on the discharge side in accordance with DIN EN ISO 13857. High-performance radial impeller with backward-curved blades made of plastic. Dynamically balanced in accordance with DIN ISO 1940-1. Energy-saving, speed-controlled EC external rotor motor in a closed design in IP 54 with the highest levels of efficiency. Ball bearings with moisture protection insulation. Maintenance-free and free from radio interference. Integrated electronic temperature monitoring for EC motor and electronics. Supplied as standard with an external terminal box, an external maintenance switch with protection class IP 65 and an internal potentiometer for setting the control voltage and thus any fan speed between min. and max. speed. Stepless speed control with external potentiometer or stepless speed control with universal control system.