Axial wall fan

DZS 25/42 B

Article number: 0094.0041
Manufacturer: MAICO
Axial wall fan with steel wall ring, DN 250, three-phase AC, pole-changeable
Application examples: Production facility, Commercial premises, Garage, Building container, Storage facility
DZS 25/42 B IM0009968.PNG Axial wall fan with steel wall ring, DN 250, three-phase AC, pole-changeable

Characteristic curve

DZS 25/42 B - Characteristic curve

  • DZS 25/42 B IM0014488.PNG Axial wall fan with steel wall ring, DN 250, three-phase AC, pole-changeable

Dimensioned drawing

DZS 25/42 B - Dimensioned drawing [mm]

  • DZS 25/42 B IM0008236.PNG Axial wall fan with steel wall ring, DN 250, three-phase AC, pole-changeable
  1. Steel wall plate = EZQ/DZQ model
  2. Steel wall ring = EZS/DZS model

Technical data

DZS 25/42 B - Technical data

Article DZS 25/42 B
Model Steel wall ring
Air flow volume 1.050 m³/h / 2.190 m³/h
Air volumenom 745 m³/h / 1.550 m³/h / in opt. efficiency
Pressure pfs, nom 35 Pa - 140 Pa / in opt. efficiency
Rotating speed nnom 1.430 1/min - 2.810 1/min / in opt. efficiency
Rotating speed 1.450 1/min / 2.860 1/min
Impeller type axial
Speed controllable
Reversing capacity
Type of voltage Three-phase AC
Rated voltage 400 V
Frequency 50 Hz
Nominal output 38 W / 203 W / in opt. efficiency
Inom 0,1 A / 0,35 A / in opt. efficiency
Imax 0,5 A
Degree of protection IP 55
Insulation class B
Number of poles at high speed 2
Number of poles at low speed 4
Mains cable 5 x 1,5 mm²
Installation site Wall / Ceiling
Type of installation Surface-mounted
Installation position horizontal / vertical
Material Sheet steel, galvanised
Weight 8,1 kg
Nominal size 250 mm
Width 400 mm
Height 400 mm
Depth 261 mm
Airstream temperature at nominal current -20 °C up to 60 °C
Airstream temperature at IMax -20 °C up to 60 °C
Packing unit 1 piece
Range C
GTIN (EAN) 4012799940418
Article number 0094.0041
Article DZS 25/42 B
Total efficiency η 29,7 %
Measurement category A
Efficiency category static
Efficiency level N 40,4
VSD necessary No
Year of manufacture see rating plate
Manufacturer’s name / official registration number / manufacturer's place of establishment Maico Elektroapparate-Fabrik GmbH / Freiburg registration court, HRB 601233 / Villingen-Schwenningen
Art. No. 0094.0041
PBEP / Air volumeBEP / Pfs, BEP 0,203 kW / 1.550 m³/h / 140 Pa
nBEP 2.810 1/min
Specific ratio ≈ 1
Information about dismantling and disposal see mounting instructions
Information about installation, operation and repairs see mounting instructions
Objects used to measure efficiency which are not described by the measurement category -
Sound power levelLWA7 63 dB(A) / 80 dB(A)


63 Hz

125 Hz

250 Hz

500 Hz

1 kHz

2 kHz

4 kHz

8 kHz


LWA7, low (dB(A))










LWA7, high (dB(A))










LWA8, low (dB(A))










LWA8, high (dB(A))










LWA7= housing and free inlet sound power level in dB.

LWA8= housing and free outlet sound power level in dB.


Product description


DZS 25/42 B

short description

Axial wall fan with steel wall ring, DN 250, three-phase AC, pole-changeable

Product description


  • Yellow chromated protective grille on the intake side, potection against accidental contact in accordance with DIN EN ISO 13857.
  • 8-blade impellers made of glass-fibre filled polyamide. Dynamically balanced at two levels, in accordance with performance level 6.3, DIN ISO 1940, Part 1.
  • Can be fitted in any position.

Air flow direction

  • The following illustration shows the air flow direction:
  1. Air flow direction A: With air drawn across the motor, standard
  2. Air flow direction B: With air blown across the motor, available on request
  3. Rotational direction
  4. Reversing mode: The volumetric flow is reduced by approx. 35 % with abnormal air flow direction.


  • Asynchronous motor.
  • Speed controllable. Exception: Type EZQ 45/6 B, EZS 45/6 B, DZQ 40/2 B and DZS 40/2 B.
  • Reversible. Exception: Fans with shaded-pole motors (...-E).
  • Not suitable for ventilating steam-saturated air.

Three-phase AC motor

  • DZQ and DZS model series.
  • Rated voltage 400 V, 50 Hz.
  • IP 55 degree of protection. Exception DZQ/DZS... D IP 54.
  • Thermal overload protection as a standard feature. Exception: available on request for DZQ/DZS 25/4 D and pole-changeable axial duct fans.
  • Potential-free terminal connections, which must be connected to e.g. an MV 25 protective motor switch or the control circuit of a contactor.
  • Pole-changeable fans: Ensure overload protection is guaranteed by a motor protection switch provided by the customer.
  • Pole-changeable motors with speed ratios of 8/4 or 4/2 have a Dahlander pole-changing circuit.

Electrical connection

  • To terminal block under the motor cover.

Safety instructions

  • The fan may be operated only if the protection against accidental contact with the impeller is guaranteed to be in accordance with DIN EN ISO 13857.

Special versions

  • The following special versions are available at extra cost on request:
    • Special voltages and frequencies.
    • Single-phase motors with thermal contacts or PTC thermistor, with potential-free terminal connections.
    • Condensation drainage holes.
    • Fans with enhanced anti-corrosion protection.
    • Impellers made of aluminium.
  • Information on operation at temperatures occasionally below -20°C available upon request.
  • If operating with frequency converters, the factory must be consulted.
  • Feasibility must be checked in each case.

Table of contents

Wiring diagram

DZS 25/42 B - Wiring diagram

Predecessor - successor

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