Horizontal discharge roof fan with efficiency-optimized aluminum housing and newly developed high-performance centrifugal impeller. Housing made of seawater-resistant aluminum with integrated intrusion protection. Motor support plate and base plate with inlet nozzle made of galvanized steel. Base plate with threaded screws for attaching suction-side accessories. Protective grille as standard on the outlet side in accordance with safety standards. High-performance centrifugal impeller with backward curved blades made of plastic. Dynamically balanced according to industry standards. Speed-controllable three-phase external rotor motor in enclosed design with moisture protection. Maintenance-free and interference-free. Includes external inspection switch as standard, with a high protection class.