Customer Requirement
A manufacturer of commercial AHUs had a customized version of the LWBE3G450 series and needed a standard-version datasheet for the 450mm EC centrifugal fan.
The customer’s AHU system demanded a high-performance air mover for a ducted and significantly resistant ventilation system. The LWBE3G450-188NT-21 backward-curved fan met the 12,647 m³/h maximum airflow requirement. The key performance indicator was maintaining high airflow with a static pressure of 2342 Pa. The operating temperature range was -25°C to +60°C.
The manufacturer’s target market is Europe. As a result, the standard entry requirements of 380V 3-phase, 50/60 Hz power supply and CE certification were mandatory. For integration into their building management system (BMS) and to meet energy efficiency targets like ASHRAE 90.1, the fan required flexible speed control via 0-10V, PWM, or RS485 Modbus.
Engineering Solution
The request was not for a new product, but for the standardization of documentation. The engineering decision process centered on confirming whether the standard LWBE3G450-188NT-21 model was the optimal choice. This backward-curved centrifugal fan is made from a lightweight, high-strength aluminum alloy. The selected LWBE3G-450 series centrifugal fan uses a SmartEC™ intelligent control system. It accepts 0-10V, PWM, and RS485 inputs directly. The standard fan’s default operating temperature of 25°C to +60°C meets customer requirements.
Technical Specifications
| Parameter | Value |
|---|---|
| Model Number | LWBE3G450-188NT-21-00 |
| Nominal Voltage | 380 VAC (3-Phase) |
| Voltage Range | 320 ~ 480 VAC |
| Frequency | 50/60 Hz |
| Speed | 2800 RPM |
| Air Flow (Max) | 12,647 m³/h (7439 CFM) |
| Static Pressure (Max) | 2342 Pa |
| Rated Power | 4600 W |
| Rated Current | 8.0 A |
| Noise Level (LpA) | 96 dB(A) |
| Protection Type | IP54 |
| Insulation Class | Class F |
| Operating Temperature | -25°C to +60°C |
| Control Input | 0-10VDC / PWM / RS485 |
| Life Expectancy (L10) | 40,000 hours at 40°C |
| Impeller Material | Aluminum Alloy |
| Weight | 45 kg |
| Certifications | CE, RoHS, REACH |
The combination of 12,647 m³/h airflow and 2342 Pa static pressure confirms this 450mm fan’s suitability for high-impedance applications like multi-stage filter banks in commercial AHUs.
Technical Documentation
Official Datasheet: LWBE3G450-188NT-21-00.pdf
This PDF contains the complete technical specifications, electrical data, wiring diagrams, and compliance information for the standard fan model, used by engineers for system design and verification.
This drawing shows the critical mechanical dimensions, mounting points, and the P-Q performance curve.
Why LONGWELL for AHU OEMs?
- Speed to Market: While this project was a documentation request, the customer’s initial custom fan was likely developed within our 90-day New Product Introduction (NPI) cycle.
- Cost-Performance Ratio: By selecting a standard LONGWELL model, the OEM achieves performance equivalent to top European brands but at a 35-38% lower price point. This is a decisive advantage for cost-sensitive commercial HVAC equipment manufacturing.
- Streamlined Certification: The fan carries a CE mark. Our long-standing relationship with a China-local Body shortens the certification process by 60-70%, de-risking the OEM’s own product launch schedule for the European market.
- Verified Performance Data: An OEM’s engineers must trust the data they are given. All LONGWELL performance curves, including the 12,647 m³/h and 2342 Pa figures for this fan, are based on tests performed according to AMCA 210-16 and ISO 5801 standards, ensuring accurate system modeling.
Explore our full Centrifugal Fans range.
Frequently Asked Questions
Q: What control signals are required for this OEM integration?
A: The backward-curved fan’s SmartEC™ controller accepts three common signal types:
- A 0-10VDC analog signal
- A PWM signal
- Serial communication via RS485 Modbus RTU.
Q: Compared with traditional AC motors equipped with VFDs, how is the efficiency of LWBE3G450-188NT-21?
A: The LWBE3G450-188NT-21 is equipped with a LONGWELL SmartEC™ motor and is more efficient than a standard AC induction motor. This advantage is particularly evident in the partial load conditions commonly found in variable air volume systems. It avoids the double conversion losses in an additional VFD.
Q: Can the LWBE3G450-188NT-21 be used in an outdoor Air Handling Unit?
A: Yes. The LWBE3G450-188NT-21 centrifugal fan is rated at IP54. Its wide operating temperature range is -25°C to +60°C, which is well-suited for integration into outdoor AHUs.
Q: What is the typical lead time for a bulk order for this project?
A: Standard production lead time for bulk orders is typically 15-30 days after order confirmation. For over 1,000 units order, the lead time is 6-10 weeks.
Technical Documentation & Resources
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Project Item: 7050874468-LWBE3G450-188NT-21
Project Date: 2026-07-15 05:02:38
