High-temperature centrifugal roof fan for direct or ducted ventilation of commercial and industrial buildings. Horizontal discharge. High efficiency. Low noise level. Housing made of galvanised sheet steel. Weather protection bonnet made of aluminium with openings for motor cooling. Simple installation. The motor is located outside the air flow. Suitable for the high temperature range from +65 °C to +200 °C, radial impellers with backward curved blades made of galvanised sheet steel. 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 inverter 20-50 Hz. The temperature in the fan motor is monitored by PTC thermistors. The PTC thermistors must be connected to a tripping system that permanently disconnects the fan from the mains if the temperature is too high. Electrical connection: Connection in the terminal box on the motor. Safety instructions: The fan may only be operated if contact protection for the impeller is guaranteed in accordance with DIN EN ISO 13857: DRD HT 35/4, Delivery volume: 3341 m3/h, Speed: 1460 1/min, Impeller type: radial, Speed controllable: yes, Reversible: no, Voltage type: three-phase current, Rated voltage: 400 V, Mains frequency: 50 Hz, Rated power: 250 W, INenn: 0.85 A, Protection rating: IP 55, Thermal class: F, Pole-changing: no, Installation location: roof, Installation position: vertical, Housing material: Aluminium / galvanised sheet steel, Impeller material: galvanised sheet steel, Colour: silver, Weight: 30 kg, Weight with packaging: 30.5 kg, Nominal width: 350 mm, Width: 815 mm, Height: 540 mm, Depth: 815 mm, width with packaging: 830 mm, height with packaging: 600 mm, depth with packaging: 830 mm, fluid temperature at IMax: 65 °C to 200 °C, PTC DIN 44082: M 100.