Three-phase version: Axial duct fan, in three-phase version. Brief description: Pipe sleeve made of galvanized sheet steel, with flange on both sides. 8-blade impellers made of glass fiber reinforced polyamide. Flange holes in accordance with DIN EN 12220:1998. DZR 56/6 B and DZR 56/4 B: Flange holes in accordance with DIN EN 12220: 1998. To avoid vibration transmission to the pipe system: Use elastic connecting pieces, feet and vibration dampers. 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 through high-quality materials such as low-noise ball bearings. Fans are maintenance-free. Can be installed in any position. Air flow direction: The air flow direction is marked. Standard exhaust air operation, air flow direction suction via motor. Three-phase motor: DZR series. Asynchronous motor. Not suitable for conveying water vapor-saturated air. Rated voltage 400 V, 50 Hz. High protection class IP 55. Exception DZR ... D IP 54. Speed controllable. Exception for type DZR 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 air flow direction is abnormal. Thermal overload protection as standard. Exception for type DZR 25/4 D and pole-changing axial tube 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 on site. Electrical connection: External terminal box with cable grommets. Safety instructions: The fan may only be put into operation if the impeller is protected against contact in accordance with DIN EN ISO 13857, e.g. with a Maico protective grille SG. Article: DZR 25/2 B, delivery volume: 2190 m3/h, delivery volumeNominal: 1580 m3/h / in opt. efficiency, pressure pfs, nominal: 137 Pa - in opt. efficiency, speed nNominal: 2280 1/min - in opt. Efficiency, speed: 2913 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: 175 W / in opt. efficiency, INom: 0.35 A / in opt. efficiency, IMax: 0.4 A, protection class: IP 55, thermal class: B, pole-changing: no, mains cable: 7 / 1.5 mm2, installation position: horizontal / vertical, material: sheet steel, galvanized, color: silver, weight: 8.26 kg, weight with packaging: 9.1 kg, nominal width: 250 mm, width: 304 mm, height: 372 mm, depth: 300 mm, width with packaging: 420 mm, height with packaging: 440 mm,Depth with packaging: 330 mm, conveying medium temperature at rated current: 60 °C, conveying medium temperature at IMax: 60 °C, overall efficiency e: 46.9%, measurement category: D, efficiency category: total, efficiency level N: 58.2, VSD required: no, year of manufacture: see type plate, manufacturer name / official registration number / manufacturer's place of business: Maico Elektroapparate-Fabrik GmbH / Register court Freiburg, HRB 601233 / Villingen-Schwenningen, PBEP / conveying volumeBEP / Pfs, BEP: 0.163 kW / 1810 m3/h, nBEP: 2890 1/min, specific ratio: approx. 1, information on dismantling and disposal: see assembly instructions, information on installation, operation and maintenance: see assembly instructions, items used in the efficiency measurement that are not described by the measurement category: -, pf, BEP: 152 Pa, Sound power levelLWA5: 82 dB(A), DC motor: false