Blauberg Box Centrifugal Fans for Rectangular Ducts

This document provides comprehensive information on the Blauberg Box series of centrifugal fans designed for rectangular air ducts. It covers applications, construction, motor details, performance characteristics, and dimensions.

Application

The Box fans are suitable for supply and exhaust ventilation systems in commercial, office, and other public or industrial premises. They are designed for rectangular air ducts with cross-sections ranging from 400x200 mm to 1000x500 mm.

Key performance indicators:

Airflow capacity: up to 15,000 m³/h (4167 l/s)
Power consumption: from 136 W
Sound pressure level: from 50 dBA

Construction

The fan casing and impeller are made of galvanized steel, resistant to atmospheric conditions.
Designed for continuous operation without shutdown.
Equipped with standard 20 mm wide mounting flanges for direct attachment to rectangular air ducts.
A service hatch is integrated into the casing for motor access and maintenance.
The fan includes a built-in terminal box with a sealed cable gland for power connection.

Motor

Features 2-, 4-, or 6-pole asynchronous motors with external rotors and backward-curved blades.
Available in single-phase (E) or three-phase (D) versions.
Equipped with ball bearings for extended service life.
Impellers are dynamically balanced.
Thermal protection against overheating is provided by built-in thermal contacts with automatic reset or terminals for external protection devices.
Thermal contact terminals are designed for connection to contactor circuits, overload relays, or autotransformer/thyristor regulators.

Speed Control

Smooth or step-by-step speed regulation can be achieved using autotransformer or thyristor regulators (sold separately).

Mounting

Designed for installation in rectangular ducts and can be mounted in any position.
Mounting flanges have pre-drilled holes for direct attachment to air ducts.
Adaptation to round ducts is possible using an optional adapter with a round nozzle.
When connecting to flexible ductwork, ensure the fan is securely mounted using supports, suspensions, or brackets.
Ensure access to the service hatch for maintenance during installation.

Technical Specifications and Dimensions

The following tables detail the technical specifications and dimensions for various Blauberg Box fan models.

Model	Flange Size (W x H), cm	Poles	Phase
Box 40x20 2E	40x20; 50x25; 50x30; 60x30; 60x35; 70x40; 80x50; 100x50	2; 4; 6	E: single-phase D: three-phase

Model	B (mm)	B1 (mm)	H (mm)	H1 (mm)	H2 (mm)	L (mm)	Weight (kg)
Box 40x20 2E	400	440	200	240	240	500	11.25
Box 50x25 2E	500	540	250	290	290	640	17.88
Box 50x30 4E	500	540	300	340	340	680	19.80
Box 50x30 4D	500	540	300	340	340	680	19.80
Box 60x30 4E	600	640	300	340	342	680	27.77
Box 60x30 4D	600	640	300	340	342	680	27.77
Box 60x35 4E	600	640	350	390	390	735	36.38
Box 60x35 4D	600	640	350	390	390	735	36.38
Box 60x35 4E max	600	640	350	390	390	652	30.00
Box 70x40 4D	700	740	400	440	440	753	41.00
Box 80x50 4D	800	840	500	540	540	903	54.00
Box 100x50 4D	1000	1040	500	540	720	1150	126.00
Box 100x50 6D	1000	1040	500	540	720	1150	120.00

Performance Data

The following tables and charts provide detailed technical characteristics, including power consumption, current, airflow, speed, and sound pressure levels for various models. Performance curves illustrating static pressure versus airflow are also included.

Parameters	Box 40x20 2E	Box 50x25 2E	Box 50x30 4E	Box 50x30 4D	Box 60x30 4E	Box 60x30 4D	Box 60x35 4E	Box 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 consumption, W	138	200	305	380	220	310	230	350
Current, A	0.6	0.88	1.32	1.65	0.9	1.38	0.52	0.75
Max. airflow, m³/h (l/s)	930 (258)	1070 (297)	1720 (478)	1850 (514)	2470 (686)	2510 (697)	2530 (703)	2970 (825)
Speed, rpm	2600	2850	2550	2830	1400	1450	1360	1415
Sound pressure level at 3m, dBA	50	52	57	58	52	52	51	51
Air temperature range, °C	-25...+45	-25...+45	-25...+45	-25...+50	-25...+45	-25...+40	-25...+70	-40...+60
Protection	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4
Motor protection	IP44	IP44	IP44	IP44	IP44	IP44	IP44	IP44
ErP	2018	2018	2018	2018	2018	2018	2018	2018

Parameters	Box 60x35 4E max	Box 70x40 4D	Box 80x50 4D	Box 100x50 4D	Box 100x50 6D
Voltage, V	1~220-240	3~400	3~400	3~400	3~400
Frequency, Hz	50; 60	50; 60	50; 60	50	50
Power consumption, W	470	700	230	350	510	750	4300	1198
Current, A	2.37	3.15	0.52	0.53	1.41	1.44	6.8	2.7
Max. airflow, m³/h (l/s)	2950 (820)	3515 (976)	1700 (472)	1855 (515)	2660 (739)	2730 (758)	15000 (4167)	10500 (2917)
Speed, rpm	1370	1460	1390	1530	1235	1220	1370	900
Sound pressure level at 3m, dBA	52	53	53	55	50	50	70	69
Air temperature range, °C	-40...+80	-40...+55	-25...+55	-25...+65	-30...+60	-30...+60	-30...+60	-25...+50
Protection	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4	IPX4
Motor protection	IP44	IP44	IP44	IP44	IP44	IP44	IP44	IP44
ErP	2018	2018	2018	2018	2018	2018	2018	2018

Accessories

Various accessories are available for the Box fan series, including silencers (SD), filter boxes (KFBK, KFBT), electric heaters (EKH), water heaters (WKH), dampers (SL), gravity louvers (VG), flexible anti-vibration connectors (EVA), and speed controllers (CDTE E..., TP CDR5E D...).

Diagrams

The document includes diagrams illustrating the dimensions of different fan models and performance curves showing the relationship between static pressure, airflow, and power consumption for various models and operating conditions.

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