Brief description: Housing, base plate, inlet nozzle and rain protection hood made of galvanized sheet steel. Galvanized protective grille on the outlet side, contact protection in accordance with DIN EN ISO 13857. Stable transport eyes enable transport by crane. 8-blade impeller made of glass fiber reinforced polyamide. Thermal overload protection as standard. Fans meet the requirements of the European Ecodesign Regulation (EC) No. 327/2011 Directive 2009/125/EC. Vibration-free operation thanks to dynamically balanced impeller and motor (shaft-rotor), in accordance with quality level 6.3, DIN ISO 1940, Part 1. High ventilation-side efficiency, low operating noise. Increased durability thanks to high-quality materials such as low-noise ball bearings. Fans are maintenance-free. Reversible operation of the fans possible. Customer-specific special voltages are available as special versions on request and for an additional charge. Can be switched to ventilation or exhaust with a separate switch (except EZD ... E). Direction of flow: The direction of flow is marked. Standard exhaust air operation, direction of flow blowing over the motor. Three-phase motor: Asynchronous motor. Rated voltage 400 V, 50 Hz. Protection class DZD ... D IP 54. Protection class DZD ... B and ... E IP 55. Speed controllable. Devices can be switched in stages using an optional 5-stage transformer. Reversible. Reversing operation: The volume flow is reduced by approx. 35% if the direction of flow is abnormal. Thermal overload protection as standard. Exception: For type DZD 25/4 D (motor protection switch is provided on site). The connections are potential-free on terminals and must be connected to a full motor protection switch e.g. MV 25 or the control circuit of a contactor. Electrical connection: Connection cable, approx. 1.7 m long. Safety instructions: The fan may only be operated if the impeller is protected against contact in accordance with DIN EN ISO 13857, e.g. with Maico protective grille SG. A professional permanent installation with a horizontal installation position, permanently laid electrical supply line and correct air flow via shaft or pipe is required. Article: DZD 25/4 D, delivery volume: 800 m3/h, speed: 1425 1/min, impeller type: axial, speed controllable: yes, reversibility: yes, voltage type: three-phase current, rated voltage: 400 V, mains frequency: 50 Hz, nominal power: 50 W, IMax: 0.14 A, protection class: IP 54, thermal class: B, mains supply line: 5 / 1.5 mm2, installation location: roof, installation position: vertical, material: sheet steel, galvanized, color: silver, weight: 11.51 kg, weight with packaging: 13.93 kg, nominal width: 250 mm, width: 570 mm, height: 570 mm, depth: 325 mm, width with packaging: 610 mm, height with packaging: 610 mm, depth with packaging: 360 mm, conveying medium temperature at rated current: -20 °C to 60 °C, conveying medium temperature at IMax: -20 °C to 60 °C