Pipe sleeve made of galvanized sheet steel, with flanges on both sides. 8-blade impellers made of glass fiber reinforced polyamide. Dynamically balanced in 2 planes, in accordance with quality level 6.3, DIN ISO 1940, Part 1. 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. High protection class IP 55. Exception EZR/DZR... D IP 54. Installation possible in any position. Motor: asynchronous motor, speed controllable. Exception: type DZR 40/2 B. Not suitable for conveying air saturated with water vapor. The conveying direction is marked on the device with a direction of rotation and conveying direction arrow. Reversing operation: The volume flow is reduced by approx. 35% if the conveying direction is abnormal. Three-phase motor: DZR series. Rated voltage 400 V, 50 Hz. Thermal overload protection as standard. Exception: Available on request for DZR 25/4 D and pole-changing axial tube fans. The connections are potential-free on terminals and must be connected to a motor protection switch, e.g. MV 25, or the control circuit of a contactor. Pole-changing fans: Ensure overload protection with a motor protection switch to be provided by the customer. 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. Article: DZR 40/42 B, delivery volume: 4550 m3/h / 9140 m3/h, delivery volumeNominal: 3190 m3/h / 6580 m3/h / in opt. efficiency, pressure pfs, nominal: 90 Pa - 350 Pa - in opt. efficiency, speed nNominal: 1480 1/min - 2920 1/min - in opt. efficiency, speed: 1487 1/min / 2948 1/min, impeller type: axial, speed controllable: yes, reversible: yes, voltage type: three-phase current, rated voltage: 400 V, mains frequency: 50 Hz, rated power: 240 W / 1610 W / in opt. Efficiency, INom: 0.8 A / 2.7 A / im opt. Efficiency, IMax: 4 A, Protection class: IP 55, Thermal class: F, Pole-changing: yes, Number of poles at high speed: 2, Number of poles at low speed: 4, Mains cable: 5 / 1.5 mm2, Installation position: horizontal / vertical, Material: Sheet steel, galvanized, Weight: 24.6 kg, Nominal width: 400 mm, Width: 460 mm, Height: 523 mm, Depth: 370 mm, Conveyor temperature at nominal current: 60 °C, Conveyor temperature at IMax: 60 °C, Packaging unit: 1 piece, Overall efficiency ?: 58.3%, Measurement category: D, Efficiency category: total, Efficiency level N: 63.7, 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 / Discharge volumeBEP / Pfs, BEP: 0.24 kW / 1.61 kW / 7900 m3/h, nBEP: 2930 1/min, specific ratio: ? 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: 380 Pa, Sound power level LWA5: 76 dB(A) / 93 dB(A)