FB3G400-48PK-30 Backward Curved Centrifugal Fan, 48VDC, 400mm, 5996.4 m3/h

The FB3G400-48PK-30 is a high-flow, high-pressure backward centrifugal fan engineered to replace multiple smaller fans in demanding industrial and HVAC systems, delivering a maximum airflow of 5996.4 m3/h and static pressure up to 750 Pa from a single 400 mm impeller. This 48 VDC unit operates on a wide 36–57 V input range, making it a plug-and-play upgrade for telecommunications shelters, energy storage cabinets, and data center cooling where -48 VDC bus power is standard. The 600 W brushless DC motor (BLDCDC137) achieves 1850 RPM with an efficiency that cuts energy consumption by up to 30% compared to traditional AC fans, while the glass-fiber-reinforced polypropylene impeller offers excellent chemical resistance and reduced rotational inertia for quieter operation at just 73 dB(A). Built for continuous duty, this fan features die-cast aluminum housing, sealed ball bearings rated for 50,000 hours at 60°C, and full protection against over-voltage, under-voltage, over-current, and locked-rotor conditions. With PWM speed control and a tachometer output, the FB3G400-48PK-30 integrates seamlessly into smart building management systems, allowing precise airflow modulation for variable load conditions. Its robust construction and IP54-rated ingress protection make it suitable for agricultural ventilation, marine HVAC, and industrial filtration units exposed to dust and humidity. Certified to CE, RoHS, and UL standards, this FANOVA fan delivers the reliability and performance required for 24/7 operation in mission-critical environments, backed by a two-year warranty and global technical support.

The FB3G400-48PK-30 represents a class-leading solution in the backward curved centrifugal fan segment, specifically engineered for applications demanding both high volumetric flow and elevated static pressure from a single, compact unit. At its core lies a 400 mm diameter impeller fabricated from polypropylene reinforced with 30% glass fiber, a material choice that provides exceptional dimensional stability under thermal stress, resistance to a wide range of chemicals including acids and solvents, and a significant weight reduction—approximately 40% lighter than a comparable steel impeller—which translates into lower bearing loads and extended mechanical life. The impeller features 12 backward-curved blades with a proprietary airfoil profile, optimized via computational fluid dynamics (CFD) to maximize aerodynamic efficiency across the entire operating range, achieving a peak static efficiency of 68% at the design point of 1850 RPM. This rotation speed, coupled with the large impeller diameter, enables the fan to move 5996.4 m3/h of air at free delivery conditions, while maintaining a maximum static pressure of 750 Pa—a combination that allows for long duct runs, multiple bends, and high-resistance filtration systems without sacrificing airflow. The drive system is a fully integrated brushless DC motor, model BLDCDC137, featuring a 137 mm outer rotor design with a high-energy-density NdFeB permanent magnet rotor and a concentrated winding stator. This motor architecture eliminates the need for external motor housings and reduces axial length, enabling a more compact fan footprint. The motor is powered by a wide-range 48 VDC input (36–57 V), drawing a maximum current of 12.5 A at full load, and is driven by a sensorless field-oriented control (FOC) algorithm that ensures smooth, ripple-free torque output and near-silent electrical noise. Speed regulation is achieved via a 0–10 V analog input or a 10 kHz PWM signal, with a tachometer output (open-collector, 3 pulses per revolution) for closed-loop feedback to a central controller. The control electronics are potted in a thermally conductive resin for vibration resistance and heat dissipation, and include comprehensive protection functions: reverse polarity, over-voltage (above 60 V), under-voltage (below 30 V), over-current (trip at 15 A), over-temperature (motor winding at 120°C), and locked-rotor auto-restart with a 30-second delay. The fan housing is a single-piece die-cast aluminum volute with a powder-coated finish, providing a rigid structure that minimizes vibration and acoustic resonance; the inlet ring is machined to a tight tolerance (0.1 mm) to prevent recirculation losses. Two deep-groove ball bearings, pre-lubricated with high-temperature lithium grease, support the motor shaft, offering a design life of L10 50,000 hours at 60°C or L10 30,000 hours at 80°C ambient—suitable for continuous operation in unconditioned environments. Electrically, the fan is supplied with a 500 mm long, 20 AWG, UL-rated cable (three conductors for power, ground, and signal) terminated with a 4-pin JST connector, ensuring secure and tool-free installation. Ingress protection is rated IP54 for the motor and IP20 for the exposed terminals, making the fan suitable for indoor industrial use with occasional dust and moisture exposure, but not for direct water jets. Production units undergo a 100% run-in test at full speed for one hour, during which vibration levels (below 6.3 mm/s RMS), current draw, and noise output (73 dB(A) at 1 meter, free field) are validated against strict factory limits. The FB3G400-48PK-30 carries CE (LVD 2014/35/EU and EMC 2014/30/EU), RoHS, and REACH certifications, and is manufactured in an ISO 9001:2015 certified facility. For integration into telecommunications and data center environments, the fan supports DCIM (Data Center Infrastructure Management) connectivity via optional Modbus RTU interface, allowing real-time monitoring of speed, power, and fault status. With its combination of high airflow, high static pressure, low power consumption relative to output, and 48 VDC compatibility, this FANOVA fan is the optimal choice for upgrading legacy AC-powered systems in telecom cabinets, battery rooms, solar hybrid inverters, and industrial process ventilation where energy savings and reliability are paramount.

DC Backward Curved Centrifugal Fan
Type	FB3G400-48PK-30
Model	BLDCDC137

Ⅰ.When taking out the fan, do not directly lift the fan lead wire. If the lead wire is excessively stressed, the internal welding part may fall off

Ⅱ.Do not plug or unplug the fan lead plug when the fan is running

Ⅲ.If the fan does not work after starting, do not touch the impeller, rotor, or other parts, professional technical personnel are required to inspect the fan to prevent sudden start of the fan from causing hand or other personal injury

Ⅳ.The power line and control line of the fan cannot be connected in reverse, otherwise it will burn out

Ⅴ.Because of the soft start characteristics of the fan, to prevent personal injury, do not touch the impeller or other parts of the fan during powered on or running at low speeds

Ⅵ.The fan needs to be operated and used under the guidance of professional personnel to prevent children from coming into touch this product

Ⅶ.If the power line is worn or damaged, it needs to be returned to the manufacturer for repair or be replaced under the guidance of the manufacturer

Ⅷ.As a part of the fan, it is not recommended to use the motor alone when there is no impeller or loading

1. High Efficiency: The FB3G400-48PK-30 delivers 5996.4 m3/h at 750 Pa while drawing only 600W, achieving 30-40% energy savings over equivalent AC fans through FANOVA's BLDC motor technology.

2. Industrial-Grade Impeller: The 400mm galvanized steel sheet impeller resists corrosion, wear and high temperatures, making the fan suitable for harsh industrial environments and corrosive gas streams.

3. Wide Application Range: Suitable for industrial ventilation, dust extraction, HVAC units, agricultural ventilation and new-energy equipment, offering flexible customized solutions (OEM/ODM).

4. Sustainable Development: Low-voltage DC operation enables direct solar and battery integration; recyclable steel impeller and optimized BLDC drive meet eco-friendly requirements with long-term reliability.

5. Easy Installation and Maintenance: Compact 400mm footprint, 0-10VDC/PWM speed control, FG tach output and standard cable make the fan simple to wire, control and service.

Q1:What kind of payments do you support?

A1: For sample order, 100% payment in advance; For batch order, 30% in advance and 70% will be paid before shipping

Q2.Will you provide samples?

A2: Sample is available and can be delivered within 10days

Q3:How can I choose a more suitable model?

A3: We need the information like fan type, quantity, size, material, voltage, air flow and static pressure.

Q4:How can I place the order?

A4:  Usually quote you within 24 hours  after  we get your inquiry. First sign the PI,pay deposit,then we will arrange the production.After finished production need you pay balance. Finally we will ship the Goods.

Q5:About transportation

A5: All available shipping ways could be applied, express shipping, air or sea. Appointed shipping company or our own forwarders all could be used in shipment. Full-way tracking the cargos for you before the goods arrive. 

Q6:How long is the warranty period?

A6: We currently offer 3-year quality guarantee for our own products, and in response to current product problems, our company provides line support, and some customers have been able to improve their products.