CENTRIFUGAL FAN
High-efficiency EC external rotor motor integrated with aerodynamic backward-curved impeller. 0-100% stepless speed regulation via RS485 / 0-10V. Designed for engineers who demand precision, reliability, and zero-maintenance operation across demanding industrial and commercial applications.
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ERP 2026 (Ready） high efficiency EC motor centrifugal blower solutions.
Engineer a better life through greentech philosophy & innoviration optimize infrastructure with IE5 motor technology.
With Blauberg Motoren at the forefront, dedicated to providing top-tier fans to our valued customers
We specialize in backward curved centrifugal fans from 133 mm to 630 mm. EC, AC and DC motor variants cover 25 W to 5.5 kW, enabling engineers to match airflow, voltage, controls and installation requirements to each project.
- 133mm–630mm
- EC / AC / DC Motors
- 25W–5.5KW
- ErP 2026 Ready
- EC Motor Technology
- 133mm
Product sizes
- 190mm
Product sizes
- 225mm
Product sizes
- 280mm
Product sizes
- 355mm
Product sizes
- 450mm
Product sizes
- 560mm
Product sizes
- 175mm
Product sizes
- 220mm
Product sizes
- 250mm
Product sizes
- 310mm
Product sizes
- 400mm
Product sizes
- 500mm
Product sizes
- 630mm
Product sizes
Redefine your ventilation with Blauberg Motoren’s high-performance
backward curved centrifugal fans
- Our innovative free-running design ensures exceptional airflow and quiet operation with unmatched reliability.
- Designed for efficiency and versatility, these fans provide a powerful solution for diverse application needs.
- Rely on Blauberg Motoren’s engineering excellence to deliver the quality and airflow performance your business demands.
Deliver high-quality ventilation solutions with optimized cost structure, ensuring strong value for global OEM and project-based customers, since 1900.
Retrofit and Intelligent Ventilation Fan Grid
Smart Grid ：High reliability with redundancy, lower maintenance thanks to direct drive without belts or grease, and high energy efficiency with EC motors.
Blauberg Motoren Fans:
A Reliable Solution for Data Center Cooling
Cooling systems are critical to data center infrastructure. Continuous heat generation from server equipment requires reliable and uninterrupted heat dissipation to ensure stable system operation. Blauberg Motoren fans are perfectly suited for integration into various cooling solutions, such as computer rooms, CRAC units, and hot/cold aisle containment systems.
Precision Airflow Solutions Built for CRAC
（Computer Room Air Conditioning）
In data centers and server rooms, Computer Room Air Conditioning (CRAC) units operate 24/7 to manage the intense heat generated by IT infrastructure. Blauberg Motoren EC centrifugal fans are the trusted choice for CRAC internal airflow — delivering high static pressure, intelligent variable-speed control, and whisper-quiet operation. Whether deployed in underfloor-supply, in-row, or overhead-return configurations, our fans provide consistent and reliable airflow performance. Designed to support PUE optimization goals, our EC fan solutions help facility operators reduce cooling energy consumption without compromising thermal protection for critical equipment.
Industry core applications
EC external rotor motor technology powers six high-growth industries - delivering precise,continuous, and maintenance-free airflow solutions to customers across 90+ countries in ventilation,refrigeration, purification, and new energy sectors.
Data Centers
High-efficiency server cooling with intelligent speed control.
Healthcare & Cleanrooms
3D blades provide ultra-quiet operation and zero belt-dust contamination.
Agriculture
Reliable ventilation for livestock and greenhouses with IP54/IP55 protection.
Commercial Buildings
Perfect for Fan Coil Units (FCU) and Air Handling Units (AHU).
Maximizing Data Center Uptime:
The Critical Role of EC Centrifugal Fans
in Air Handling Units
A deep-dive into the aerodynamic engineering, IE efficiency standards, and operational economics driving the shift from AC to EC fan technology in mission-critical cooling infrastructure. High-density server equipment generates continuous heat loads that demand uninterrupted dissipation. Blauberg EC fans deliver high airflow, low noise, and 24/7 reliable operation — purpose-built for CRAC precision air conditioning, in-row cooling units, and free cooling systems. Modbus connectivity enables real-time integration with DCIM platforms .
- CRAC Precision Air Conditioning — server row cooling
- Edge Computing Nodes & Small Server Room Ventilation
- Hot/Cold Aisle Containment — uniform temperature distribution
- Free Cooling Systems — reducing PUE and energy costs
- Cooling Unit Retrofits — replacing legacy inefficient fans
HVAC & AHU
Replace traditional belt-driven fans with intelligent Fan Grid arrays to modernise Air Handling Units (AHUs). The BL-PF modular centrifugal fan array works in concert with the STG-VFD central controller — automatically adjusting speed via differential pressure sensing to maintain constant airflow, eliminating belt and grease maintenance entirely.
- Large commercial building AHU retrofit — no belt maintenance
- Hospitals, schools & shopping centres — energy-saving upgrade
- Industrial facilities — high-redundancy parallel fan operation
- New-build AHU integration — modular fast-track delivery
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![Blauberg BE-B400H-EC-05 400mm DC Backward Centrifugal Fan]()
Blauberg BE-B400H-EC-05 400mm DC Backward Centrifugal FanThe Blauberg BE-B400H-EC-05 is a compact 400 mm DC backward-curved centrifugal fan with 48 VDC (36-57 VDC range) power, IP44 protection and 0-10 V/PWM speed control.
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![Blauberg BE-B400D-EC-05 400mm DC Backward Centrifugal Fan]()
Blauberg BE-B400D-EC-05 400mm DC Backward Centrifugal FanThe Blauberg BE-B400D-EC-05 is a compact 400 mm DC backward-curved centrifugal fan with 48 VDC power, IP44 protection and 0-10 V/PWM speed control.
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![Blauberg BE-B355C-EC-05 355mm DC Backward Centrifugal Fan]()
Blauberg BE-B355C-EC-05 355mm DC Backward Centrifugal FanThe Blauberg BE-B355C-EC-05 is a compact 355 mm DC backward-curved centrifugal fan with 48 VDC (36-57 VDC range) power, IP44 protection and 0-10 V/PWM speed control.
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![Blauberg BN-B310C-EC-01 310mm DC Backward Centrifugal Fan]()
Blauberg BN-B310C-EC-01 310mm DC Backward Centrifugal FanThe Blauberg BN-B310C-EC-01 is a compact 310 mm DC backward-curved centrifugal fan with 310 VDC power, IP55 protection and 0-10 V/PWM speed control.
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![Blauberg BE-B310D-EC-N07 310mm DC Backward Centrifugal Fan]()
Blauberg BE-B310D-EC-N07 310mm DC Backward Centrifugal FanThe Blauberg BE-B310D-EC-N07 is a compact 310 mm DC backward-curved centrifugal fan with 48 VDC power, IP44 protection and 0-10 V/PWM speed control.
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![Blauberg BE-B310D-EC-05 310mm DC Backward Centrifugal Fan]()
Blauberg BE-B310D-EC-05 310mm DC Backward Centrifugal FanThe Blauberg BE-B310D-EC-05 is a compact 310 mm DC backward-curved centrifugal fan with 48 VDC (36-57 VDC range) power, IP44 protection and 0-10 V/PWM speed control.
-
![Blauberg BE-B310C-EC-01 310mm DC Backward Centrifugal Fan]()
Blauberg BE-B310C-EC-01 310mm DC Backward Centrifugal FanThe Blauberg BE-B310C-EC-01 is a compact 310 mm DC backward-curved centrifugal fan with 48 VDC power, IP55 protection and 0-10 V/PWM speed control.
-
![Blauberg BD-B310D-EC-N07 310mm DC Backward Centrifugal Fan]()
Blauberg BD-B310D-EC-N07 310mm DC Backward Centrifugal FanThe Blauberg BD-B310D-EC-N07 is a compact 310 mm DC backward-curved centrifugal fan with 24 VDC power, IP44 protection and 0-10 V/PWM speed control.
Refrigeration
COMMERCIAL REFRIGERATION
Full coverage across refrigerated display cases, supermarket cold chains,freezer warehousing, and cold logistics. EC fans operate reliably at -25°C,delivering 30%+ energy savings versus AC motor equivalents with zero-maintenance sealed bearing design.
OPERATING TEMP
-25°C~+50°C
ENERGY SAVING
≥30%vsAC
Industrial
INDUSTRIAL VENTILATION
Engineered for factories, warehouses, clean rooms, and tunnel applications.Full range of axial, backward-curved, forward-curved, and cross-flow impellertypes -30mm to 630mm diameter, max airflow 12,000 m3/h, with wide-voltage customisation and Modbus control.
IMPELLER RANGE
30-630mm
MAX. AIRFLOW
12,000m3/h
Purification
AIR PURIFICATION & FRESH AIR
Ultra-quiet, high-efficiency airflow for residential and commercial airpurifiers, HRV/ERV fresh air units, and medical clean rooms. EC cross-flowand forward-curved centrifugal fans deliver whisper-quiet performance inultra-slim housings with intelligent speed modulation via Modbus.
SERVICE LIFE
50,000h
PROTOCOL
Modbus RTU
New Energy / EV
EV CHARGING-BATTERY THERMAL MANAGEMENT
As global public EV charging points are projected to grow from -4 million(2023)to over 15 milion by 2030 (IEA) thermamanagement demand for charging cabinet cooling and energy storage BMS is surging rapidly. Blauberg DC/EC compactfans - 12V/24V low-voltage DC powered, high reliability, and long service life - are the preferred choice for EVinfrastructure thermal management.
SUPPLY VOLTAGE
12/24VDC
SIZE RANGE
20-97mm
PROTECTION
IP55
Home Appliance
CONSUMER ELECTRONICS & HOME APPLIANCES
Serving cooker hoods, residential fresh air units,air purifiers, tumble dryers, and dishwasher exhaust systems. The full Blauberg EC external-rotor motor range starting from just 30mm -offers ultra-compact design, low vibration low noise, and wide-voltage compatibility, fully certified for all major global markets.
MIN. DIAMETER
30mm
CERTIFICATIONS
UL/CE/3C
CUSTOM LEAD TIME
7-15days
Optimize Your Infrastructure Without Replacing the Entire Unit
Is your ventilation system more than 10 years old? Legacy belt-driven fans are the largest energy consumers in your building, often accounting for 40-50% of total power consumption.Transition to a Retrofit fan solution for data centers and commercial buildings. By replacing AC motors with our integrated EC centrifugal blower, you eliminate frequency converters, shielded cables, and manual motor protection. Payback Period: Typically recovered in 2 to 2.5 years.Maintenance-Free: No belt dust, no carbon brushes, and reduced motor heat.Compact Design: Our fans are available in sizes 175mm to 630mm, designed to fit even the tightest air handling units (AHUs).
IE5 Ultra-Premium Motor
- Low energy consumption -IE5 efficiency class
- No frequency converter or shielded cables needed
- Maintenance-free: no belt dust, no carbon brushes
- N+l redundancy - reliable and fail-safe
- Reduced motor heat. lower cooling load
- Sizes 175-630mm, fits all AHU configurations
- No dead zones - easy to clean
Standard Induction Motor
- High energy use -40-50% of total building power
- Requires VFD, shielded cables & motor protection
- Belt wear - frequent maintenance required
- No redundancy - higher failure risk
- High motor heat output, system instability
- Larger footprint, low retrofit flexibility
- Dust dead zones difficult to clean
-
5.1→2.2kWPower per unit
(peakload) -
56.8%Energy reduction
(30-unit retrofit case) -
1.8–2.5yrsPayback period
(electricity savings only) -
120tAnnual CO2 reduction
(30-unit system)
Single fan unit, based on measured operating data across load scenarios
| LOAD SCENARIO | AIRFLOW M3/H | AC SYSTEM (W) | EC SYSTEM (W) | SAVINGS (W)/ REDUCTION |
|---|---|---|---|---|
| 100% Peak Load | 10,000 | 3,200 | 2,450 |
750 -23%
|
| 80% Typical Load | 8,000 | 2,150 | 1,250 |
900 -42%
|
| 60% Night/Low load | 6,000 | 1,300 | 520 |
780 -60%
|
EC Technology
Features
0–100% continuously variable speed via RS485, 0–10V DC, or PWM. Enables constant-pressure, constant-flow, or constant-torque operation modes.
Overall system efficiency >60%. 15%–30% more efficient than comparable AC fans. EC motor + optimized backward-curved aerodynamics deliver maximum air per watt.
Multiple EC fans wired in parallel form a Fan Wall. If one unit fails, remaining fans auto-compensate airflow — ensuring uninterrupted system operation.
MODBUS protocol integration for building automation systems. Real-time motor status monitoring, fault alerts, remote start/stop, and energy consumption logging.
Built-in protection against overload, overvoltage, undervoltage, locked-rotor. No external protection components required. Continuous
Direct-drive: no belts, couplings, or lubrication. Sealed maintenance-free bearings rated to 50,000h service life. EC motor eliminates brush replacement.
360° continuous rotation adjustment. Supports horizontal, vertical and inclined orientations. Compact footprint enables tight-space installations.
Backward-curved impeller + no mechanical commutation + skew magnetization technology. Measured noise values up to 60 dB(A) max — significantly quieter than AC equivalents.
Installation
Notes
Motor and impeller are directly integrated. Eliminates need for belts, couplings, or gearboxes — reducing installation complexity and maintenance touchpoints.
Compatible with standard BL modular mounting brackets for Fan Wall configurations. Supports 2×2 to 4×4 array stacking with daisy-chain wiring.
Outlet can be oriented to any angle. Suitable for horizontal, vertical, inclined installations. Particularly useful in space-constrained AHU retrofits.
Single power + signal connector. Multi-fan daisy-chain reduces field wiring to one control cable. Supports wide input voltage 1~120V / 1~230V / 3~400V.
Backward curved centrifugal fan
| Parameter | EC | DC |
|---|---|---|
| Impeller Diameter [mm] | Φ133–630 | Φ133–630 |
| Rated voltage [V] | 115 / 230 / 380 AC | 24 / 48 / 80 / 110 / 310 DC |
| Frequency [Hz] | 50 / 60 | – |
| Airflow [m³/h] | 240–13,200 | 190–4,700 |
| Power Input Max [W] | 2,100 | 500 |
| Operating Temp [°c] | -25 ~ +60 | -25 ~ +60 |
| Protection Class | IP44 / IP55 | IP44 / IP55 |
| Insulation Class | B, F | B, F |
| Speed Control | 0~10VDC / PWM / RS485 | 0~10VDC / PWM / RS485 |
-
Φ630mm
Max diameter -
12,000m3/h
Max airflow -
IP55
Protection -
0–10V/PWM/RS485
Speed control
Airflow performance test standard
The air performance test of Blauberg fans complies with the relevant requirements for air volume and air pressure testing specified in GB/T 1236-2017 Industrial Ventilators - Performance Testing Using Standardized Air Ducts. This standard version is equivalent to ISO 5801:2007, which means that GB/T 1236-2017 and ISO 5801:2007 are identical in terms of technical content. As the origin standard, AMCA 210 has led to the international harmonization of ISO 5801, while GB/T 1236 represents Chinese adoption of this international standard.
Examples for
installation systems
The fans are intended for ventilation equipment and shall be operated in strict compliance with their intended use, the installation instructions, and DIN EN 292/294 equipment safety regulations.
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Effects of centrifugal
air gap change
The centrifugal air gap between the inlet ring and the impeller cover affects centrifugal fan air flow and operation efficiency. Changes in the size of the inlet ring air gap affects the following curve:
Changes in axial
overlap
The axial overlap between the inlet ring and the impeller cover affects centrifugal fan air flow and operation efficiency. Overlap changes affect the following curve:
Mounting space
effects
Mounting-specific losses may be caused by installing the centrifugal fan in a ventilation block with insufficient space. The effects on fan performance are evident from the following curve. For boxes with a square cross section the hydraulic diameter is calculated based on the box width and height divided by the impeller diameter.
Blauberg Motoren China
part of the Blauberg Group since 1900
Specializes in EC brushless motors and intelligent fan solutions, delivering precise, maintenance-free, and energy-efficient air-moving performance throughout the product lifecycle.
With localized manufacturing in China and integrated expertise in motor technology, electronic control, and aerodynamics, our EC fans are trusted by customers in over 90+ countries across ventilation, refrigeration, and air purification industries. We combine German engineering standards with scalable, cost-competitive production to enable sustainable, high-performance solutions for a greener and healthier world.
German Engineering Quality
Smart Manufacturing Value - Since 1900
Offering an extensive range of EC motors, fans and intelligent ventilation solutions
Your global partner in regulatory
excellence
From product design and testing to certification review, Blauberg Motoren helps OEM customers prepare axial fan projects for global market requirements.
Packing & shipping
Every unit undergoes our rigorous, standardized packaging process and multi-tier quality inspection before being securely sealed for transit. We honor your trust, ensuring flawless and safe delivery every time.
PRODUCT INSPECTION
100% quality inspection before packaging
Protective Wrapping
Full foam wrapping for 360° shockproof protection.
Sturdy Carton
5-Layer Corrugated Box, Plastic-Wrapped.
Palletizing
Securely stacked and strapped on pallets for safe handling.
Loading & Shipping
Carefully loaded and shippedto ensure timely delivery.
Backward Centrifugal Fan FAQs
for Buyers and OEMs
Why choose an EC Backward Curved Fan over a forward curved AC fan?
Does retrofitting an AC fan require replacing the entire cabinet or housing?
How does Modbus RS485 (or 0–10 V / PWM) control improve system uptime?
What is an "external rotor" motor and why does it matter for fan design?
What protection rating and service life can I expect?
Which certifications are required for different markets, and do your products carry them?
Suzhou Blauberg Motoren Technology Co., Ltd. is one of the most professional backward centrifugal fans manufacturers and suppliers in China, featured by quality products and good service. Please rest assured to buy bulk customized backward centrifugal fans from our factory. Welcome to contact us for quotation.
