Box-I
Centrifugal fans in sound-insulated casing for rectangular ducts
Use
Supply and exhaust ventilation systems installed in various premises. Compatible with 400x200 up to 600x350 mm rectangular air ducts.
Air flow:
up to 3515 m³/h 976 l/s
Power:
from 136 W
Noise level:
from 45 dBA
2025 | INDUSTRIAL VENTILATION
Design
Atmospheric resistant galvanized steel casing and impeller. The casing is heat- and sound-insulated with 50 mm mineral wool. 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 fan is equipped with a built-in terminal box with a leaded outside sealed electrical lead-in for connection to power mains.
Motor
Two- or four-pole asynchronous motor with external rotor and centrifugal impeller with backward curved blades. 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 automatic restart or with leaded outside terminals for connection to external protecting controls. The thermal switch terminal leads are designed for connection to respective circuit of the contacter, overload relay or respective terminals of the autotransformer or thyristor speed controller.
Speed control
Step speed control with an external auto transformer (available upon separate order).
Mounting
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. The fan is suitable for mounting into round duct at intake flange with a round reducer (available upon separate order). If vibration-absorbing flexible 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.
INLINE FANS FOR RECTANGULAR DUCTS
Designation key Series Box-I
Accessories Silencers
Flange size (width x height) [cm] 40x20; 50x25; 50x30; 60x30; 60x35
Motor Number of poles 2; 4
Phase E: single-phase D: three-phase
Filter boxes
Electric heaters Water heaters Air dampers
Gravity dampers
Flexible antivibration connectors
Speed controllers
SD
KFBK
KFBT
EKH
WKH
SL
VG
286
EVA
CDR5E E...TP CDR5E D... M
blaubergventilatoren.net
blaubergventilatoren.net
Dimensions [mm]
Type
Box-I 40x20 2E Box-I 50x25 2E Box-I 50x30 4E Box-I 50x30 4D Box-I 60x30 4E Box-I 60x30 4D Box-I 60x35 4E Box-I 60x35 4D
B
B1
B2
B3
H
H1
H2
H3
L
Weight [kg]
400 420 440 500 200 220 240 360 500 24.5 500 520 540 600 250 270 290 410 640 27.6 500 520 540 600 300 320 340 460 680 37.2 500 520 540 600 300 320 340 460 680 37.2 600 620 640 700 300 320 340 460 680 43.5 600 620 640 700 300 320 340 460 680 43.5 600 620 640 700 350 370 390 530 735 56.2 600 620 640 700 350 370 390 530 735 56.2
H3 H2 H1 H
INLINE FANS FOR RECTANGULAR DUCTS
Technical data
Parameters
Voltage [V] Frequency [Hz] Power [W] Current [A] Maximum air flow [m³/h (l/s)] RPM [min¹] Sound pressure at 3 m [dBA] Transported air temperature [°C] IP rating Motor IP rating ErP
Box-I 40x20 2E
50 138 0.6 930 (258) 2600 45
1 ~ 230
-25...+45 IPX4 IP44 2018
60 200 0.88 1070 (297) 2850 47
Box-I 50x25 2E
50 305 1.32 1720 (478) 2550 51
1 ~ 230
-25...+45 IPX4 IP44 2018
60 380 1.65 1850 (514) 2830 52
BOX-I 40x20 2E
Sound power level, A-weighted
Total
Octave frequency bands [Hz]
LpA LpA
63 125 250 500 1000 2000 4000 8000 3 m 1 m
LwA to inlet [dBA]
75
LwA to outlet [dBA]
79
LwA to environment [dBA] 66
64 70 70 66 61 61 66 70 73 72 69 69 42 54 61 60 61 51
58 51 54 64 68 61 58 68 47 37 45 55
BOX-I 50x25 2E
Sound power level, A-weighted
Total
Octave frequency bands [Hz]
LpA LpA
63 125 250 500 1000 2000 4000 8000 3 m 1 m
LwA to inlet [dBA]
75
LwA to outlet [dBA]
79
LwA to environment [dBA] 72
62 69 71 60 63 67 64 63 68 71 70 74 71 71 40 55 67 67 64 59 53
59 55 65 65 59 69 44 51 61
Pressure, P [Pa] Pressure, P [Pa]
600
500
400
300
200
100
0 0
220 190 160 130 100
0
Power [W]
600
800
700 500
50 Hz 60 Hz
50 Hz 60 Hz 600
400 500
300
400
300 200
200
100 100
0 200 0
220 190 160 130 100 200 0
400 200 400 200
600 400 600 400
800 600 1000800
0 1000 0
Air flow [m3/h] Air flow [m3/h] 400
Power [W]
360
320
280
800600 1000800
240 1000 0
Pressure, P [Pa] Pressure, P [Pa]
Power [W]
800
700
600
500
400
300
200
100
0 400 0 400 360 320 280 240 400 0
350
50 Hz 60 Hz
300 50 Hz 60 Hz 250
200
150
100
50
800400 800400
1208000 1200800
16010200
20010600
0 2000
Air flow [m3/h] Air flow [m3/h]
Power [W]
16010200
20010600
170 150 130 110 90 20000
Pressure, P [Pa] Pressure, P [Pa]
Power [W]
350
300
250
200
150
100
50
0 4000
170 150 130 110 90 4000
Power [W]
INDUSTRIAL VENTILATION | 2025
500
]
500
]
]
500
]
500
]
287
700
]
700
2025 | INDUSTRIAL VENTILATION
Parameters
Voltage [V] Frequency [Hz] Power [W] Current [A] Maximum air flow [m³/h (l/s)] RPM [min¹] Sound pressure at 3 m [dBA] Transported air temperature [°C] IP rating Motor IP rating ErP
Box-I 50x30 4E
50 140 0.57 1700 (472) 1390 48 -25...+45
1 ~ 230
IPX4 IP44 2018
60 175 0.73 1855 (515) 1530 50 -25...+50
Box-I 50x30 4D
50 136 0.34 1380 (383) 1360 47 -25...+65
3 ~ 400
IPX4 IP44 2018
60 165 0.53 1620 (450) 1600 50 -25...+55
BOX-I 50x30 4E
Sound power level, A-weighted
Total
Octave frequency bands [Hz]
LpA LpA
63 125 250 500 1000 2000 4000 8000 3 m 1 m
LwA to inlet [dBA]
78
LwA to outlet [dBA]
83
LwA to environment [dBA] 69
60 68 70 62 74 57 68 72 72 77 46 58 64 61 61
72 68 62 58 68 77 75 70 62 72 60 56 51 48 58
BOX-I 50x30 4D
Sound power level, A-weighted
Total
Octave frequency bands [Hz]
LpA LpA
63 125 250 500 1000 2000 4000 8000 3 m 1 m
LwA to inlet [dBA]
77
LwA to outlet [dBA]
81
LwA to environment [dBA] 68
59 67 69 61 73 71 56 67 71 71 75 75 46 57 63 60 60 59
67 61 56 66 74 69 61 71 55 50 47 57
Power [W] Power [W]
INLINE FANS FOR RECTANGULAR DUCTS Pressure, P [Pa] Pressure, P [Pa]
350
50 Hz 60 Hz
300 50 Hz 60 Hz 250
200
150
100
50
0
20010600
0 2000
ow [m3/h] Air flow [m3/h]
0
20010600
170 150 130 110 90 20000
350
300
250
200
150
100
50
0 4000
170 150 130 110 90 4000
350
350
Pressure, P [Pa] Pressure, P [Pa]
300
300
50 Hz
50 Hz
60 Hz
60 Hz 250
250
50 Hz 60 Hz
50 Hz 60 Hz
200
200
150
150
100
100
50
50
800400 800400
1200800 1200800
16010200
20010600
0 2000
Air flow [m3/h] Air flow [m3/h] 170
150
130
110
16010200
20010600
90 20000
Power [W] Power [W]
0 200 400
170 150 130 110 90 200 400
60200 80400 100600 120800 141000 1610200 1810400 1600 1800 Air flow [m3/h] Air flow [m3/h]
60200 80400 100600 120800 141000 1610200 1810400 1600 1800
700
700
Pressure, P [Pa] Pressure, P [Pa]
600
600
50 Hz
50 Hz
60 Hz
60 Hz 500
500
400
400
300
300
200
200
100
100
Pressure, P [Pa] Pressure, P [Pa]
50 Hz 60 Hz
600 50 Hz 60 Hz 500
400
300
200
100
600
50 Hz
50 Hz
500
60 Hz
60 Hz
3~400 -
3~400 -
400
delta connectiondelta connection
3030~400Y-
3~400Y-
star connection star connection
200
100
0
25002000 2882500 0
ow [m3/h] Air flow [m3/h]
0 500 01000 5010500 10200000 15205000 20300000 25305000 3000
0 3500 0
Air flow [m3/h] Air flow [m3/h]
0
500 01000 5015000 10200000 15205000 203000 25305000 30b0l0aube3rg50v0entilatoren.net
Air flow [m3/h] Air flow [m3/h]
blaubergventilatoren.net
600
600
800
800
350
350
Pressure, P [Pa] Pressure, P [Pa]
Pressure, P [Pa] Pressure, P [Pa]
Pressure, P [Pa] Pressure, P [Pa]
500
500
Parameters
Voltage40[V0]
400
Frequency [Hz]
50 Hz 60 Hz
50
700
700
50 Hz
6B0oHxz-I66000x30 4E
600
1 5~02030
500
60
300
300
50 Hz
50 Hz
Bo6x0-IH6z0x30 4D 60 Hz 250
250
3 ~ 400
50
60200
200
Power [3W00]
300
Current [A]
Maximum air flow [m³/h (l/s)]
RPM [m2i0n0¹]
200
Sound pressure at 3 m [dBA]
220
400
0.9
2470 (686)
300
1400
46
200
403010 1.38
2531000(697) 1450
20406
230 0.52 2530 (703) 1360 45
235
0.51350
150
2630 (731)
1600
47100
100
Transpo10rt0ed air tempe10ra0ture [°C] IP rating
-25...+45
-25...+40
I1P0X04
100
-25...+70
-25...+65
IPX4
50
50
Motor IP rating
IP44
IP44
Power [W] Power [W]
ErP
0 0
BOX-I 62200x30 4E
190 SAo-wuenidghp1to6ew0der level,
130
LwA to in1l0e0t [dBA] LwA to outle0t [dBA]
0 200 0
220 190 160 Total 130 100 81 200 085
400200
600400
800600 1000800
1000
20108 0
Air flow [m3/h] Air flow [m3/h]
400
Octave frequency bands [Hz] 63 125 250 500 1000 2000
4000
8000
LpA 3 m
360
LpA 1 m
320
280
70 77 77 72 66 66 64 55 4702027007 8060074900 75 80076500 74100086060
61 65
71 107050
240 0
Power [W] Power [W]
0 4000
804000
1208000
16012000 201820106000
200000
Air flow [m3/h] Air flow [m3/h]
BOX-I 64000x30 4D
360 SAo-wuenidghp3to2ew0der level,
280
Total
170
Octave frequency bands [Hz]
150 LpA
63 125 250 500 1000 2000 4000 8013000 3 m
110
LwA to in2l4e0t [dBA]
80
LwA to ou4t0l0e0t [dBA] 804000 84
69 75 75 71 65 65 63 17201800705 78 1607120700 74 2070416000 73
56245090000
59 63
Power [W] Power [W]
0 4000
170 LpA 150 1 m 130
110 69 90 73 4000
LwA to environment [dBA] 67 43 55 62 61 62 53 48 38 46 56
LwA to environment [dBA] 66 43 54 61 60 61 52 48 38 45 55
Pressure, P [Pa] Pressure, P [Pa]
500
400
300
200
100
0 0
320 290 260 230 200
0
500
500
400
50 Hz
50 Hz 400
60 Hz
60 Hz
300
300
200
200
100
100
0 500 0
320 290 260 230 200 500 0
1000500
15010000
20001500 25020000
0
2500
0
Air flow [m3/h] Air flow [m3/h]
1000500 15010000 20001500 25002000
230
210
2500
190 0
Power [W] Power [W]
Pressure, P [Pa] Pressure, P [Pa]
500
700
700
Pressure, P [Pa] Pressure, P [Pa]
INLINE FANS FOR RECTANGULAR DUCTS
600
600
400
50 Hz
50 Hz
60 Hz
60 Hz 500
500
300
400
400
200
300
300
200
200
100
100
100
0 500 0
230 210 190 500 0
1000500 1000500
15010000 15010000
20001500 25020000
2500
0 0
Air flow [m3/h] Air flow [m3/h]
750
650
550
450
20001500 25020000
2500
350 0
Power [W] Power [W]
0 500 01000 501
750 650 550 450 350 500 01000 501
Power [W] Power [W]
INDUSTRIAL VENTILATION | 2025
289
2025 | INDUSTRIAL VENTILATION
350
350
350
350
Pressure, P [Pa] Pressure, P [Pa]
Pressure, P [Pa] Pressure, P [Pa]
300
300
50 Hz
50 Hz
60 Hz
P6a0raHmz e2t5e0rs
250
300
300
50 Hz
50 Hz
60 HzBox-I 60x36504HEz 250
250
50 Hz
60 Hz Box-I 60x35 4D
50 Hz 60 Hz
Voltage [V]
Frequen20c0y [Hz]
200
1 ~ 230
50
20600
3 ~ 400
200 50
60
3 ~ 400 Y
50
60
Power [W]
470
700
510
750
380
515
Current15[A0]
150
2.37
315.105
150 1.41
1.44
0.7
0.93
Maximum air flow [m³/h (l/s)]
2950 (820)
3515 (976)
2970 (825)
3410 (947)
2660 (739)
2730 (758)
RPM [m1i0n0¹]
100
Sound pressure at 3 m [dBA]
1370 47
1104060 47
100 1415 46
1610 46
1235 46
1220 46
Transpor5t0ed air tempera5t0ure [°C] IP rating
-40...+80
-405...0+55
IPX4
50 -40...+60
-40...+60
IPX4
-40...+80
-40...+40
IPX4
Motor IP rating
0
20010600 ErP
0 2000
0 4000
800400
1200800
16010200
IP44 200102600018
IP44
IP44
0 2000
200
0 400
60200 82040108 100600 120800 141000 1610200 1810400 20161080 1800
ow [m3/h] Air flow [m3/h]
Power [W] Power [W]
BOX-I 61070x35 4E
150 SAo-wuenidghp1t1o3e1w00der level,
170 150 130 Total 110
0
20010600LwA to in2l90e00t00[dBA]
49000801
LwA to outlet [dBA]
83
LwA to environment [dBA] 68
Air flow [m3/h] Air flow [m3/h]
Air flow [m3/h] Air flow [m3/h]
170
150
Octave frequency bands [Hz]
LpA LpA 130
63 125 250 500 1000 2000 4000 8000 3 m 1 m 110
Power [W] Power [W]
170
BOX-I 61500x35 4D
Sound p1o3w0 er level, A-weigh1t1e0d
Total
Octave frequency bands [Hz]
LpA LpA
63 125 250 500 1000 2000 4000 8000 3 m 1 m
73 8070740073 71020087010 72 72 73 74 78
701601020608 77 74
582001060601
71
90 20000
Lw2A0t0o inl9e400t 0[dBA6] 0200
804008010060703 127086000 7314100609 161702000 186104900 618600 571800 60
70
62 63 73
LwA to outlet [dBA]
83 71 71 73 74 77 76 74 62 62 72
40 55 61 63 62 57 54 46 47 57
LwA to environment [dBA] 67 40 54 60 62 61 56 53 46 46 56
700
700
INLINE FANS FOR RECTANGULAR DUCTS Pressure, P [Pa] Pressure, P [Pa]
600
600
50 Hz
50 Hz
60 Hz
60 Hz 500
500
400
400
300
300
200
200
100
100
Pressure, P [Pa] Pressure, P [Pa]
50 Hz 60 Hz
600 50 Hz 60 Hz 500
400
300
200
100
600
50 Hz
50 Hz
500
60 Hz
60 Hz
3~400 -
3~400 -
400
delta connectiondelta connection
3030~400Y-
3~400Y-
star connection star connection
200
100
25002000
0 2500 0
ow [m3/h] Air flow [m3/h]
750
650
550
450
25002000
350 2500 0
Power [W] Power [W]
0 500 01000
750 650 550 450 350 500 10000
5010500 5015000
10200000 10200000
15205000 15205000
20300000 25305000 3000
0 3500 0
Air flow [m3/h] Air flow [m3/h]
20300000 25305000 3000
750 650 550 450 350 250 3500 0
Power [W] Power [W]
0 500 01000 5015000 10200000 15205000 203000 25305000 3000
3500
Air flow [m3/h] Air flow [m3/h]
750 650 550 450 350 500 25010000
3~400Y
3~400 3~400Y 3~400
3~400 3~400
3~400Y
3~400Y
5105000 10200000 15205000 20300000 25305000 3000
3500
290
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