BLAUBERG Box-I Centrifugal Fans

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

✅ ErP 2018 compliant

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.
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.
Thermal switch terminal leads are designed for connection to respective circuit of the contacter, overload relay, or autotransformer/thyristor speed controller terminals.

Speed Control

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

Mounting

Designed for mounting inside rectangular air ducts and can be installed in any position.
Fan flanges connect to air ducts via bolts inserted into flange holes.
Suitable for mounting into round duct at intake flange with a round reducer (available upon separate order).
If vibration-absorbing flexible connectors are used, ensure their fixation to mounting structures with supports or brackets.
Provide adequate space for accessing the cover for service operations during mounting.

Designation Key

Series	Flange Size (width x height) [cm]	Motor Poles	Phase	Accessories
Box-I	40x20; 50x25; 50x30; 60x30; 60x35	2; 4	E: single-phase D: three-phase	Silencers (SD), Filter boxes (KFBK), Electric heaters (KFBT), Water heaters (EKH), Air dampers (WKH), Gravity dampers (SL), Flexible antivibration connectors (VG), Speed controllers (CDTE E... TP, CDR5E D... M)

Dimensions

Diagram Description: A diagram shows a fan unit with dimensions labeled B, B1, B2, B3, H, H1, H2, H3, and L.

Type	B	B1	B2	B3	H	H1	H2	H3	L	Weight [kg]
Box-I 40x20 2E	400	420	440	500	200	220	240	360	500	24.5
Box-I 50x25 2E	500	520	540	600	250	270	290	410	640	27.6
Box-I 50x30 4E	500	520	540	600	300	320	340	460	680	37.2
Box-I 50x30 4D	500	520	540	600	300	320	340	460	680	37.2
Box-I 60x30 4E	600	620	640	700	300	320	340	460	680	43.5
Box-I 60x30 4D	600	620	640	700	300	320	340	460	680	43.5
Box-I 60x35 4E	600	620	640	700	350	370	390	530	735	56.2
Box-I 60x35 4D	600	620	640	700	350	370	390	530	735	56.2

Technical Data

Parameters	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
Voltage [V]	1~230	1~230	1~230	3~400	1~230	3~400	1~230	3~400
Frequency [Hz]	50 / 60	50 / 60	50 / 60	50 / 60	50 / 60	50 / 60	50 / 60	50 / 60
Power [W]	138 / 200	305 / 380	140 / 175	136 / 165	220 / 235	230 / 310	470 / 700	510 / 750
Current [A]	0.6 / 0.88	1.32 / 1.65	0.57 / 0.73	0.34 / 0.53	0.9 / 1.38	0.52 / 0.73	2.37 / 3.15	1.41 / 1.44
Maximum air flow [m³/h (l/s)]	930 (258) / 1070 (297)	1720 (478) / 1850 (514)	1700 (472) / 1855 (515)	1380 (383) / 1620 (450)	2470 (686) / 2530 (697)	2530 (703) / 2630 (731)	2950 (820) / 3515 (976)	2970 (825) / 3410 (947)
RPM [min⁻¹]	2600 / 2850	2550 / 2830	1390 / 1530	1360 / 1600	1400 / 1450	1360 / 1600	1370 / 1460	1415 / 1610
Sound pressure at 3 m [dBA]	45 / 47	47 / 52	48 / 50	47 / 50	46 / 47	46 / 45	47 / 47	46 / 46
Transported air temperature [°C]	-25...+45	-25...+45	-25...+45 / -25...+50	-25...+65	-25...+45	-25...+40 / -25...+70	-40...+80	-40...+55 / -40...+60
IP rating	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4
Motor IP rating	IP44	IP44	IP44	IP44	IP44	IP44	IP44	IP44
ErP	2018	2018	2018	2018	2018	2018	2018	2018

Performance Data

Sound Power Levels

Detailed sound power level data, categorized by octave frequency bands and overall levels (LpA at 3m and 1m), are provided in the tables below for each model series.

BOX-I 40x20 2E

Sound power level, A-weighted	Octave frequency bands [Hz]								Total
Sound power level, A-weighted	63	125	250	500	1000	2000	4000	8000	LpA 3m	LpA 1m
LwA to inlet [dBA]	64	70	70	66	61	61	58	51	75	64
LwA to outlet [dBA]	66	70	73	72	69	69	68	61	79	68
LwA to environment [dBA]	42	54	61	60	61	51	47	37	66	55

BOX-I 50x25 2E

Sound power level, A-weighted	Octave frequency bands [Hz]								Total
Sound power level, A-weighted	63	125	250	500	1000	2000	4000	8000	LpA 3m	LpA 1m
LwA to inlet [dBA]	62	69	71	60	63	67	64	59	75	65
LwA to outlet [dBA]	63	68	71	70	74	71	71	65	79	69
LwA to environment [dBA]	40	55	67	67	64	59	53	44	72	61

BOX-I 50x30 4E

Sound power level, A-weighted	Octave frequency bands [Hz]								Total
Sound power level, A-weighted	63	125	250	500	1000	2000	4000	8000	LpA 3m	LpA 1m
LwA to inlet [dBA]	60	68	70	62	74	72	68	62	78	68
LwA to outlet [dBA]	57	68	72	72	77	77	75	70	83	72
LwA to environment [dBA]	46	58	64	61	61	60	56	51	69	58

BOX-I 50x30 4D

Sound power level, A-weighted	Octave frequency bands [Hz]								Total
Sound power level, A-weighted	63	125	250	500	1000	2000	4000	8000	LpA 3m	LpA 1m
LwA to inlet [dBA]	59	67	69	61	73	71	67	61	77	66
LwA to outlet [dBA]	56	67	71	71	75	75	74	69	81	71
LwA to environment [dBA]	46	57	63	60	60	59	55	50	68	57

BOX-I 60x30 4E

Sound power level, A-weighted	Octave frequency bands [Hz]								Total
Sound power level, A-weighted	63	125	250	500	1000	2000	4000	8000	LpA 3m	LpA 1m
LwA to inlet [dBA]	70	77	77	72	66	66	64	55	81	71
LwA to outlet [dBA]	72	77	80	79	75	75	74	66	85	75
LwA to environment [dBA]	43	55	62	61	62	53	48	38	67	56

BOX-I 60x30 4D

Sound power level, A-weighted	Octave frequency bands [Hz]								Total
Sound power level, A-weighted	63	125	250	500	1000	2000	4000	8000	LpA 3m	LpA 1m
LwA to inlet [dBA]	69	75	75	71	65	65	63	54	80	69
LwA to outlet [dBA]	71	75	78	77	74	74	73	65	84	73
LwA to environment [dBA]	43	54	61	60	61	52	48	38	66	55

BOX-I 60x35 4E

Sound power level, A-weighted	Octave frequency bands [Hz]								Total
Sound power level, A-weighted	63	125	250	500	1000	2000	4000	8000	LpA 3m	LpA 1m
LwA to inlet [dBA]	73	77	73	70	71	70	68	58	81	71
LwA to outlet [dBA]	72	72	73	74	78	77	74	62	83	73
LwA to environment [dBA]	40	55	61	63	62	57	54	46	68	57

BOX-I 60x35 4D

Sound power level, A-weighted	Octave frequency bands [Hz]								Total
Sound power level, A-weighted	63	125	250	500	1000	2000	4000	8000	LpA 3m	LpA 1m
LwA to inlet [dBA]	73	76	73	69	70	69	68	57	80	70
LwA to outlet [dBA]	71	71	73	74	77	76	74	62	83	72
LwA to environment [dBA]	40	54	60	62	61	56	53	46	67	56

Performance Curves Description

Pressure vs. Airflow: For all models, the performance curves consistently show a decrease in static pressure as airflow increases. Performance varies slightly between 50 Hz and 60 Hz operation, with 60 Hz often providing higher pressure at lower airflows. The curves illustrate the fan's operating range.

Power vs. Airflow: The power consumption curves demonstrate a general increase in power required as airflow increases. Similar to pressure curves, 60 Hz operation typically requires more power than 50 Hz operation for a given airflow rate.

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