High-temperature radial roof fan for direct or ducted ventilation of commercial and industrial buildings. Horizontal exhaust. High efficiency and low noise level. Housing made of galvanized steel sheet. Weather protection hood made of aluminum with openings for motor cooling. Easy installation. The motor is located outside the airflow. Suitable for high-temperature range from +65 °C to +200 °C, radial impellers with backward-curved blades made of galvanized steel sheet. Radial impellers are statically and dynamically balanced. Motor: asynchronous three-phase motor. Protection class IP 55. Speed controllable with frequency converter. Permissible frequency range for speed control with frequency converter 20-50 Hz. The temperature in the fan motor is monitored by thermistors. The thermistors must be connected to a triggering system that permanently disconnects the fan from the power supply at excessive temperatures. Electrical connection: connection in the terminal box on the motor. Safety notes: The fan may only be operated if the touch protection for the impeller complies with DIN EN ISO 13857. Article: DRD HT 40/4, Airflow volume: 4608 m³/h, Speed: 1460 rpm, Impeller type: radial, Speed controllable: yes, Reversibility: no, Voltage type: three-phase, Rated voltage: 400 V, Network frequency: 50 Hz, Rated power: 550 W, INenn: 1.6 A, Protection class: IP 55, Temperature class: F, Pole switchable: no, Installation location: roof, Installation position: vertical, Housing material: aluminum / galvanized steel sheet, Impeller material: galvanized steel sheet, Color: silver, Weight: 35 kg, Weight with packaging: 42 kg, Nominal diameter: 400 mm, Width: 815 mm, Height: 590 mm, Depth: 815 mm, Width with packaging: 1020 mm, Height with packaging: 715 mm, Depth with packaging: 1020 mm, Medium temperature at IMax: 65 °C to 200 °C, PTC DIN 44082: M 100.