FB3G280-48AL-3W2 Backward Curved Centrifugal Fan, 48VDC, 280mm, 3781 m3/h

When an HVAC system must push air through long duct runs, dense filtration banks, or multiple outlet branches, the FB3G280-48AL-3W2 from FANOVA delivers the high static pressure and massive airflow that lesser fans simply cannot achieve. This 48VDC backward centrifugal fan combines a 280mm die-cast aluminum impeller with a 710.4W brushless DC motor to generate up to 3781 m3/h of airflow at a maximum static pressure of 1013 Pa, making it a true workhorse for demanding industrial and new-energy applications. Its 48-volt architecture aligns perfectly with telecommunications standard -48VDC power plants and DCIM (Data Center Infrastructure Management) systems, enabling seamless integration into existing DC-powered infrastructure without the need for AC-to-DC conversion. The die-cast aluminum construction of both the impeller and housing ensures exceptional rigidity and thermal conductivity, while the 137mm rotor diameter contributes to smooth, balanced operation at 2930 RPM. With a noise rating of just 86.5 dB(A) — remarkably quiet for such a high-output unit — this fan can be deployed in environments where worker comfort matters, including ventilation rooms and industrial clean spaces. The motor is protected with full insulation, and the integrated speed control allows precise airflow modulation, enhancing energy efficiency in variable-demand systems. Backed by FANOVA's OEM/ODM expertise and rigorous quality testing, the FB3G280-48AL-3W2 is an excellent choice for high-static-pressure ventilation, HEPA filtration, and heavy-duty cooling applications, all while offering the reliability of a 20AWG, 1000mm cable for straightforward installation.

The FANOVA FB3G280-48AL-3W2 is a high-performance backward centrifugal fan engineered for applications that demand both high volumetric flow and elevated static pressure. At its core is a 48VDC brushless DC motor (BLDCDC137) with a power rating of 710.4W and a nominal current draw of 14.8A, operating over a wide input voltage range of 36 to 57VDC to accommodate fluctuations in DC bus supplies. The motor drives a 280mm diameter impeller at a rated speed of 2930 RPM, producing a maximum airflow of 2225.1 CFM (3781 m3/h) and a maximum static pressure of 4.05 inches of water gauge (1013 Pa). This level of static pressure is well suited for overcoming resistance from HEPA filters, long ductwork, and multi-branch discharge systems, making the fan ideal for cleanrooms, industrial exhaust, and telecom cooling units. The impeller is precision die-cast from aluminum alloy, offering excellent dimensional stability, corrosion resistance, and low inertia for rapid response to speed changes. The fan housing and endcaps are also die-cast aluminum, which enhances heat dissipation and structural integrity, ensuring long service life even in continuous-duty operation. The brushless DC motor features electronic commutation, eliminating brush wear and reducing electromagnetic interference, while integrated Hall sensors and a dedicated control interface allow for external speed control via PWM or analog voltage signals. Thermal protection and insulation Class B safeguard the motor against overload and high ambient temperatures, while the ball bearing system is rated for an L10 life of up to 50,000 hours at rated conditions, reducing maintenance intervals. The electrical connection is provided through a 20AWG cable with a length of 1000mm, terminated with a two-pin connector, and the cable is strain-relieved to prevent damage from vibration. The fan is designed to operate within a temperature range of -20°C to +60°C, and its IP20 protection rating makes it suitable for indoor installations where dust and moisture are controlled. Each unit undergoes rigorous testing for air performance, vibration, and noise, complying with ISO 5801 and AMCA standards, and is available with optional certifications such as CE, RoHS, and UL (on request). With its combination of high static pressure, high airflow, and 48VDC input compatibility, the FB3G280-48AL-3W2 is a versatile solution for OEMs and system integrators seeking a robust, energy-efficient fan for mission-critical applications.

DC Backward Curved Centrifugal Fan
Type	FB3G280-48AL-3W2
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 FB3G280-48AL-3W2 delivers 3781 m3/h at 1013 Pa while drawing only 710.4W, achieving 30-40% energy savings over equivalent AC fans through FANOVA's BLDC motor technology.

2. Industrial-Grade Impeller: The 280mm 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 280mm 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.