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Blauberg Box-F 90x50 8D

Centrifugal fan for rectangular ducts. Maximum air flow up to 7175 m³/h.
EAN codeEAN4058448063312
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Designation key
  • Dimensions
  • Additional characteristics
  • Accessories

Supply and extract ventilation systems installed in various premises. Compatible with 400x200 up to 1000x500 mm rectangular air ducts.

Four-, six- or eight-pole asynchronous motor with external rotor and centrifugal impeller with forward curved blades. Due to its impeller design the fan has excellent air dynamic charakteristics (high performance and pressure drop). Single-phase (E) or three-phase (D) motor modifications. Equipped with ball bearings for longer service life. Dynamically balanced impeller. Overheating protection by built-in thermal switches with leaded outside terminals for connection to external protecting controls. The thermal switch terminal leads are designed for connection to respective circuit ot the overload relay or respective terminals of the autotransformer or thyristor speed controller.


Atmospheric resistant galvanized steel casing and impeller. The fan is rated for continuous operation. Fitted with standard 20 mm connecting flanges for connection to rectangular air ducts. Access cover on the casing for inspection and maintenance operations. The fans with standard size from 40x20 up to 60x35 are equipped with a terminal block integrated into the casing with leaded outside sealed electrical lead-in for connection to power mains. The fans with standard size from 70x40 up to 100x50 are equipped with an external terminal block for connection to power mains.


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. Mounting to a round air duct on exhaust flange through a round pipe reducer. Available upon 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.


Smooth speed control with an external thyristor controller or step speed control with an external auto transformer (both available upon separate order).

Parameter Box-F 90x50 8D Measurement unit
Voltage 400 V
Phase 3 ˜
Frequency 50 Hz
Power 2000 W
Current 4.1 A
RPM 680 min-1
Maximum air flow 1993 l/s
Maximum air flow 7175 m³/h
Sound pressure level at 3 m 59 dBА
Max. operating temperature -20...+40 °С
Motor IP rating IP44 -
Ingress protection rating IPX4 -
EC motor no -
Weight 90.0 kg
Width 900 mm
Height 500 mm
Casing material galvanized steel -
Outdoor mounting no -
Sound-insulated casing no -
Air duct for rectangular air ducts -
Design centrifugal -
Type Exhaust, Supply -
Mounting Inline -
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-F - data sheet (pdf 1.18Mb)
Box-F - image (png 543.99Kb)
Box - user's manual (pdf 3.76Mb)
Designation key
Designation key
Series Flange size (width x height) [cm] Motor
Number of poles
Box-F 40x20; 50x25; 50x30; 60x30; 60x35; 70x40; 80x50; 90x50; 100x50 4; 6; 8 E: single-phase
D: three-phase

Model Overall dimensions [mm]
B B1 B2 H H1 H2 H3 L
Box-F 90х50 8D 900 920 940 500 520 540 580 954
Additional characteristics
Additional characteristics
Sound power level, A-weighted Octave frequency bands [Hz]
Total 63 125 250 500 1000 2000 4000 8000
3 m
1 m
LwA to inlet [dBA] 87 77 79 75 81 82 79 75 70 67 77
LwA to outlet [dBA] 93 73 75 81 91 85 84 83 73 73 83
LwA to environment [dBA] 79 62 66 77 72 69 68 64 56 59 69
Silencer Filter boxes Electric heater Water heater Air dampers Flexible antivibration connector


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