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Blauberg Box EC 50x25-1 max

Centrifugal fans with EC motor for rectangular ducts. Maximum air capacity up to 2870 m³/h.
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Designation key

Supply and extract ventilation systems installed in various premises. For arranging energy-saving and controllable ventilation systems. Compatible with 300x150 up to 1000x500 mm rectangular air ducts.


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.  
The turbine 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.  


The fan is controlled with a 0-10 V external control signal, e.g. CDT E/0-10 speed controller for EC motors. The fan air capacity is regulated by various parameters, including temperature level, pressure, smoke, etc.When a control parameter changes the EC motor changes its rotation speed to provide the best suitable air flow.  

Data exchange between PC and fan for setting and control of operating parameters. The fans with EC motors can be integrated into a unified decentralized computerized network to adjust ventilation system with respect to specific user's demands.      

Parameter Box EC 50x25-1 max Measurement unit
Voltage 200-277 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 a distance of 3 m 51 dBА
Temperature of transported air -25…+50 °С
EC motor yes -
Ingress protection rating IPX4 -
Motor IP rating IP54 -
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
Box-EC - data sheet (pdf 2.42Mb)
Box-EC - image (png 438.26Kb)
Box - user's manual (pdf 3.04Mb)
Box-EC - user's manual (pdf 1.34Mb)

Type          Dimensions [mm]
B B1 B2 H H1 H2 H3 L
Box EC 50x25-1 max 500 520 540 250 270 290 360 530


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;