Three-phase version: Axial wall fan with steel wall ring, in three-phase version. Brief description: For surface mounting. Protective grille on the suction side, contact protection in accordance with DIN EN ISO 13857. 8-blade impellers 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 efficiency on the ventilation side, low operating noise. Increased durability thanks to high-quality materials such as low-noise ball bearings. Fans are maintenance-free. Can be installed in any position for ventilation and exhaust ventilation. Air flow direction: The air flow direction is marked. Standard exhaust air operation, air flow direction suction via motor. Three-phase motor: DZQ/DZS series. Asynchronous motor. Not suitable for conveying air saturated with water vapor. Rated voltage 400 V, 50 Hz. Protection class IP 55. Exception for type DZQ ... D IP 54. Speed controllable. Exception for type DZQ 40/2 B and DZS 40/2 B. 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 conveying direction is abnormal. Thermal overload protection as standard. Exception for type DZQ/DZS 25/4 D and pole-changing axial wall fans available on request. The connections are potential-free on terminals and must be connected to a motor protection switch, e.g. MV 25-1, or the control circuit of a contactor. Pole-changing fans: Ensure overload protection with a motor protection switch to be provided by the customer. Pole-changing motors with speed ratios of 8/4 or 4/2 are connected according to the Dahlander principle. Electrical connection: On the terminal block in the end cover of the motor. 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. Article: DZS 25/4 D, design: steel wall ring, flow rate: 1000 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, rated power: 45 W, INom: 0.13 A, IMax: 0.13 A, protection class: IP 54, thermal class: B, pole-changing: no, mains cable: 5 / 1.5 mm2, installation location: wall / ceiling, installation type: surface-mounted, installation position: horizontal / vertical, material: sheet steel, galvanized, color: silver, weight: 3.47 kg, weight with packaging: 4.08 kg, nominal width: 250 mm, width: 400 mm, height: 400 mm, depth: 198 mm, width with packaging: 380 mm, height with packaging: 220 mm, depth with packaging: 380 mm, conveying medium temperature at nominal current: -20 °C to 50 °C, conveying medium temperature at IMax: -20 °C to 40 °C, closing flap: without