Belmont B-Max Series Centrifugal Fans: A High-Efficiency Solution for AHU, Refrigeration, and Industrial Ventilation Applications

Choosing the right centrifugal fan is critical for AHU manufacturers, HVAC system integrators, refrigeration equipment builders, and data-center cooling specialists. The performance of the fan directly impacts airflow stability, energy consumption, noise levels, and the long-term reliability of the entire system.

The Belmont B-Max Series Centrifugal Fans are engineered to deliver high efficiency, high static pressure, and robust durability—making them an ideal choice for OEMs and engineering professionals seeking a reliable and scalable ventilation solution.

This guide breaks down the B-Max Series in detail: design, performance, FanGrid modular options, and answers to the most common technical questions asked by global HVAC and refrigeration buyers.

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1. Overview of the Belmont B-Max Series

Developed by Changzhou Belmont Intelligent Motion Co., Ltd., the B-Max Series includes a full range of backward-curved centrifugal fans powered by external rotor motors. The product line includes:

B250 / B280 / B310 / B355 / B400 / B450 / B500 / B560
(technical details on pp. 2–5 of the product manual)

These fans are widely used across:

• Air Handling Units (AHUs)

• Commercial HVAC systems

• Cold-chain & refrigeration equipment

• Cleanroom and purification systems

• Data-center cooling and containment

• Industrial and commercial ventilation

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2. Key Advantages for Global HVAC & AHU OEMs

✔ High Efficiency With Backward-Curved Impeller Design

Backward-curved impellers generate strong static pressure while maintaining high efficiency, making them suitable for high-resistance systems such as filtration stages, coils, and plenum sections.

✔ Low Noise and Long Service Life

All models use:

• Maintenance-free ball bearings

• External rotor motors for efficient heat dissipation

• Optimized blade profiles
  (confirmed on pp. 2–5 of the catalog)

This ensures quiet, stable operation—ideal for hospitals, hotels, and commercial buildings.

✔ IP54 / IP55 Protection Ratings

• B250–B280: IP54

• B310–B560: IP55

Reliable for humid, low-temperature, and heavy-duty environments.

✔ Wide Size & Performance Range

The B-Max Series covers diameters 250–560 mm, making it suitable for both compact and large-scale AHUs as well as modular FanGrid installations.

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3. Engineering Design & Construction Details

Based on the product manual (pp. 2–5) :

Impeller Materials

• Aluminum alloy (most models)

• High-strength composite blades (B355)

Mechanical Structure

• Black painted steel brackets

• Silver sheet-steel support plates

• Rigid construction to minimize vibration

Motor Design

• External rotor type

• S1 continuous duty

• High thermal stability for 24/7 operation

Control Compatibility

• 0–10V analog control

• PWM speed regulation

• MODBUS-RTU interface (shown on page 6)

Supports both traditional HVAC controls and modern building automation systems (BAS/BMS).

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4. Performance Summary by Model (B250–B560)

A simplified engineering table based on the official data sheets (pp. 2–5) :

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5. FanGrid Modular System: A Major Competitive Advantage

The B-Max FanGrid (page 6 of the catalog)  allows multiple fans to operate in parallel, offering:

FanGrid Benefits

• More uniform airflow distribution

• Improved coil heat-exchange efficiency

• Direct-drive—no belts to replace

• Built-in redundancy (N, N+1, N+2…)

• Easy capacity expansion

• Modular installation & simple maintenance

• Control via 0–10V / PWM / MODBUS-RTU

This makes FanGrid technology ideal for data-center cooling, large AHUs, pharmaceutical cleanrooms, and mission-critical environments.

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6. Why OEMs Worldwide Prefer Belmont

Belmont offers:

• Full OEM customization

• Support for special mounting dimensions

• Tailored airflow & static pressure design

• Rapid engineering support

• Fast production and global delivery

• Complete technical documentation

These strengths are highlighted in the introduction section of the manual (page 1) .

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7. Frequently Asked Questions (FAQ)

(SEO-optimized for search queries like “best centrifugal fan for AHU”, “EC centrifugal fan FAQ”, “FanGrid vs single fan system”, etc.)

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Q1: What makes backward-curved centrifugal fans better for AHUs?

Backward-curved impellers offer higher efficiency, better static pressure performance, and lower noise compared to forward-curved designs. This makes them ideal for modern AHUs, which often require strong pressure to overcome filtration and coil resistance.

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Q2: Are Belmont B-Max fans suitable for EC controls and variable speed operation?

Yes. The B-Max Series supports 0–10V, PWM, and MODBUS-RTU, enabling full integration with EC speed control, BAS/BMS systems, and smart ventilation platforms.

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Q3: Can B-Max fans operate continuously in harsh environments?

Absolutely. With IP54/IP55 protection, external-rotor motors, and maintenance-free bearings, the B-Max Series is designed for 24/7 operation in demanding conditions such as refrigeration units, humid AHU sections, and industrial ventilation.

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Q4: What are the advantages of using a FanGrid instead of a single large fan?

A FanGrid offers:

• Redundancy (no single-point failure)

• Higher energy efficiency at partial loads

• More uniform airflow

• Shorter installation depth

• Easier maintenance and quick replacement

This modular architecture is widely used in high-end HVAC and data-center cooling systems.

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Q5: Does Belmont offer OEM customization for AHU manufacturers?

Yes. Belmont provides custom mounting plates, airflow optimization, special motor options, private-label branding, and tailored engineering support for AHU and refrigeration equipment builders.

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Q6: How can I request a datasheet or quotation?

You can contact the Belmont engineering team to request performance curves, CAD drawings, 3D models, and project-specific quotations.

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Conclusion: A Future-Ready Centrifugal Fan Solution for Global HVAC and Refrigeration Markets

With high efficiency, strong static pressure capability, robust construction, and modular FanGrid compatibility, the Belmont B-Max Series stands out as a premium centrifugal fan solution for:

• AHU manufacturers

• HVAC system integrators

• Refrigeration equipment builders

• Data-center cooling specialists

• Industrial ventilation engineers

Whether you need a compact fan for a small AHU or a multi-fan modular system for a mission-critical environment, the B-Max Series delivers performance, reliability, and engineering flexibility.

Get in touch with our engineering team to receive datasheets and project-specific quotations.