FB3G280-48PL-90 DC Backward Centrifugal Fan, 48VDC, 280mm, 2286 m3/h

The FB3G280-48PL-90 is a 48VDC large-format DC backward centrifugal fan featuring a 280mm impeller — stepping up from the 250mm platform to deliver higher airflow at lower, quieter operating speeds. Generating 2286 m³/h at 661 Pa while consuming 220W at just 2000 RPM, it achieves substantial air movement with a moderate 69.9 dB(A) noise level. The BLDC92 brushless motor draws 4.65A across a standard telecom -48VDC input range, with integrated FG tach output for precision closed-loop speed control. Compatible with 0-10VDC analog and PWM digital signals, it integrates seamlessly with DCIM and BMS platforms. The larger 280mm impeller diameter provides a broader operating range with improved efficiency at partial loads compared to smaller form factors, making it ideal for variable-air-volume DC ventilation systems. With IP44-rated ingress protection, Class B insulation, and 50,000-hour L10 service life, this fan is engineered for continuous-duty telecom and industrial DC applications. Ideal for large telecom shelter ventilation, data center airflow management, DC microgrid equipment cooling, and industrial enclosure air exchange requiring higher flow rates from a compact footprint. CE and RoHS certified.

At the core of the FB3G280-48PL-90 is a BLDC92 external rotor brushless DC motor driving a 280mm backward curved centrifugal impeller — the larger diameter providing increased blade area for enhanced airflow generation at lower RPM. Operating at 2000 RPM, the aerodynamic design achieves 75-80% efficiency, converting 220W of 48VDC power into 2286 m³/h at 661 Pa. The reduced operating speed compared to smaller-impeller equivalents contributes to the moderate 69.9 dB(A) noise level and extended bearing life. The motor draws 4.65A across its DC input range, ensuring compatibility with standard telecom -48VDC plants, solar-battery hybrid systems, and DC microgrid installations. Its comprehensive control interface accepts 0-10VDC analog signals and PWM (1-10kHz) digital inputs for stepless speed regulation, while the FG tachometer output delivers real-time RPM feedback for closed-loop integration with PLCs and DCIM platforms. Built-in protection includes soft-start, current limiting, locked-rotor protection, and reverse polarity protection. The fan features a die-cast aluminum housing with IP44-rated sealing, ball bearings for any mounting orientation, and Class B electrical insulation for safe operation to 130°C ambient. Rated for 50,000 hours L10 lifespan at 40°C, the 280mm platform offers enhanced airflow capability while maintaining the same mounting compatibility and control interface as the 250mm series.

DC Backward Centrifugal Fan
Type	FB3G280-48PL-90
Model	BLDC92

Remarks:

I. Standard lead wire length is 300mm; customized length available upon request.

II. Control via 0-10VDC analog signal or PWM digital signal.

Test condition:

I. Measurement performed according to ISO 5801, using double chamber method.

II. Test voltage: 48VDC, ambient temperature: 23±2°C, relative humidity: 50±10%.

III. Noise measured at 1m distance in anechoic chamber per ISO 3744.

IV. PQ curve shows performance across 0-100% duty cycle at rated voltage.

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. 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

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

VI. 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

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

1. 280mm Large-Format Impeller: The FB3G280-48PL-90 features a 280mm backward curved impeller — a step up from the 250mm platform — delivering 2286 m³/h at 661 Pa at only 2000 RPM. The larger diameter provides enhanced airflow with lower operating speeds, contributing to reduced noise and extended bearing life.

2. Efficient Low-Speed Operation: 75-80% aerodynamic efficiency at just 2000 RPM, converting 220W of 48VDC power into 2286 m³/h — achieving 30-40% energy savings versus AC alternatives while operating natively from standard telecom -48VDC bus power.

3. Telecom & Industrial Large-Scale Applications: Ideal for large telecom shelter ventilation, data center airflow management, DC microgrid equipment cooling, and industrial enclosure air exchange. The 280mm platform delivers higher flow rates without increasing mounting footprint complexity. OEM/ODM available.

4. Reliable Continuous Operation: Die-cast aluminum IP44 housing, ball bearings, Class B insulation to 130°C, 50,000-hour L10 lifespan at 40°C, and 3-year warranty for mission-critical 48VDC deployments.

5. DCIM-Ready Integration: 0-10VDC/PWM plus FG tach for DCIM/BMS. Standard mounting, any-orientation, maintenance-free BLDC.

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 7 days for standard models

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.