Roof fan with EC technology. Aerodynamically designed housing made of high-quality polypropylene in grey, diagonal blowing. Operating range from -30 to +80 °C. Integrated guide vanes for optimum efficiency. For horizontal installation. Diagonal impeller made of aluminum, motor-impeller unit dynamically balanced. Electronically commutated DC external rotor motor with ball bearing for continuous operation. High efficiency even in control mode. Maintenance-free and free from radio interference. Continuous speed control with the speed potentiometer P..10 (accessory). In conjunction with the universal control system EUR EC (accessory), the fan can be used to control differential pressure, differential temperature or flow speed.