Vertically blowing 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 aluminum. Dynamically balanced according to DIN ISO 1940-1. Speed-controlled three-phase external rotor motor in closed design in IP 55. Ball bearing with moisture protection insulation. Maintenance-free and free from radio interference. With external maintenance switch as standard, protection class IP 65.