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Blauberg Box EC 50x25-1 max

Centrifugal fans with EC motor for rectangular ducts. Maximum air flow up to 2870 m³/h.
EAN codeEAN4058448052255
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Dimensions
  • Additional characteristics
  • Designation key
  • Accessories

Supply and extract ventilation systems installed in commercial, office and other public or industrial premises.For arranging energy-saving and controllable ventilation systems. Compatible with 300x150 up to 1000x500 mm rectangular air ducts.

The fan speed is controlled with a 0–10 V control signal from the following sources:

  • integrated or external speed controller
  • controller with sensors
  • central BMS system.

The control signal value changes depending on air temperature, pressure, smoke concentration and other parameters.During signal value change the fan with EC motor correspondingly changes the rotations speed and delivers required air volume to the ventilation system.The computer central building management systems (BMS) enable integration of several EC motors in network and precise individual operation control for each fan.


Atmospheric resistant galvanized steel casing. The fan is rated for continuous operation always connected to power mains. Fitted with standard 20 mm connecting flanges for connection to rectangular air ducts. Access cover on the casing for inspection and maintenance operations.


High-efficient direct current EC motor with external rotor and backward curved blades. EC technology meets the up-to-date requirements to energy-saving and controllable ventilation and provides up to 35 % energy saving as compared to asynchronous motors. EC motor ensures totally controllable speed range for the fan and has integrated overheating protection with automatic restart.  
EC motor has no friction and wearing parts as capacitor und brushes. Instead a maintenance-free EC controller electronic circuit board is used.The impeller is dynamically balanced.The fan is compatible with 50 Hz and 60 Hz power mains and the maximum speed does not depend on power mains frequency.

The fan is designed for mounting inside rectangular air ducts and can be installed in any position. The fan flanges are connected to the air ducts through the bolts inserted into the flange holes. Suitable for mounting into round duct on intake flange with a round flange reducer (available upon separate order). If flexible vibration-absorbing connectors are used to connect the fan to the air ducts provide their fixation to mounting structures with supports or brackets. While mounting provide enough space for accessing the cover for service operations.  

Parameter Box EC 50x25-1 max Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50/60 Hz
Current 3.35 A
Power 444 W
RPM 3100 min-1
Maximum air flow 797 l/s
Maximum air flow 2870 m³/h
Sound pressure level at 3 m 51 dBА
Transported air temperature -25…+50 °С
Motor IP rating IP54 -
Ingress protection rating IPX4 -
EC motor yes -
Casing material galvanized steel -
Outdoor mounting no -
Air duct for rectangular air ducts -
Design centrifugal -
Type Exhaust, Supply -
SEC class -
Weight 17.9 kg
Mounting Inline -
ErP 2018 -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air capacity:
  • Pressure:
Operating point
  • Air capacity: --
  • Pressure: ---
Documents archieve
Documents archieve
Select a document type
  • Catalogues
  • Technical documentation
  • Certificates
Box EC - data sheet (pdf 1.23Mb)
Box EC - image (png 438.26Kb)
Box - user's manual (pdf 3.76Mb)
Box EC - user's manual (pdf 1.96Mb)

Model Dimensions [mm]
H H1 H2 H3 L W W1 W2
Box EC 50x25-1 max 250 270 290 328 530 500 520 540
Additional characteristics
Additional characteristics
Sound power level, A-weighted Total Octave frequency bands [Hz] LpA 3 m LpA 1 m
63 125 250 500 1000 2000 4000 8000
LwA to inlet [dBA] 86 53 82 78 79 79 75 69 68 66 76
LwA to outlet [dBA] 85 48 78 77 79 80 72 66 63 64 74
LwA to environment [dBA] 72 50 69 65 62 62 55 46 42 51 61
Designation key
Designation key
Series Motor type Flange size (width x height) [cm] Phase Motor modifications
Box EC: electronically commutated motor 30x15; 40x20; 50x25; 50x30; 60x30; 60x35; 70x40; 80x50; 90x50; 100x50

 1: single-phase
3: three-phase

_: standard type
max: high-powered motor
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