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

The FB3G280-48PL-90 is a high-airflow DC backward curved centrifugal fan engineered for 48VDC systems requiring substantial air movement. Featuring a robust BLDC92 brushless external rotor motor delivering 220W at 2000 RPM, it generates an impressive 2286 m³/h (1345 CFM) with 661 Pa of static pressure—sufficient for ducted ventilation, air handling units, and industrial cooling applications. The large 280mm impeller provides a generous swept area that moves more air per revolution than smaller form factors, making it ideal for high-volume, moderate-pressure systems. Operating on safe low-voltage 48VDC with a 36~57 VDC input range, it is compatible with telecom -48V DC plants, solar-powered ventilation, and battery-backed air handling. Equipped with 0-10VDC/PWM speed control and FG tachometer feedback (3 pulse/rev), it provides precision airflow regulation. With CE, RoHS, ISO9001, ErP2026 certifications and a 50,000-hour L10 bearing life, this fan is built for continuous-duty reliability in high-flow DC-powered applications.

At the heart of the FB3G280-48PL-90 is the BLDC92 permanent magnet brushless external rotor motor—the largest in the 280mm series—delivering 220W of shaft power while drawing 4.65A from a 48VDC supply. The wide 36~57 VDC input tolerance accommodates voltage fluctuations from lead-acid battery banks and regulated 48V supplies alike. The motor drives a 7-blade backward curved impeller crafted from glass-fiber reinforced polypropylene with a diameter of 280mm, which combines high aerodynamic efficiency with resistance to dust accumulation. At the nominal 2000 RPM, the impeller generates 2286 m³/h at 661 Pa static pressure, making it suitable for applications where high airflow volume is the primary requirement. The die-cast aluminum housing provides robust structural integrity, effective heat dissipation, and IP44 protection. Ball bearings support any-angle mounting orientation and contribute to the 50,000+ hour L10 service life at 40°C ambient. The integrated electronic controller provides comprehensive self-protection: soft-start circuitry, active current limitation, under-voltage lockout, over-voltage shutdown, independent thermal overload sensors for motor and electronics, locked-rotor detection, and reverse polarity protection. Compliant with CE, RoHS, ISO9001, ErP2026 and international standards including EN ISO 12100, EN 60204-1, and EMC standards.

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

Remarks:

I. Standard cable length. Customizable.

II. 0-10V/PWM control. Modbus RTU over RS485 optional.

Product drawing

Aerodynamic Performance Charts

Test condition:

I. Specified environment and installation mode.

II. Input Voltage: Operating voltage.

III. Temperature: Room 25°C.

IV. Humidity: 65%RH.

Safety Requirements

I. When taking out the fan, do not directly lift the fan lead wire.

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.

IV. Do not touch the impeller during powered on or running at low speeds.

V. Operate under professional guidance; prevent children contact.

VI. If power cord worn or damaged, return to manufacturer.

VII. Do not use motor alone without impeller or load.

VIII. Please read this technical manual carefully before use.

Advantages:

1. High-Airflow 280mm Performance: The FB3G280-48PL-90 delivers 2286 m³/h at 661 Pa—class-leading airflow for a 280mm form factor. Its large impeller swept area and optimized blade geometry move more air per revolution than smaller fans, making it ideal for air handling units, ducted ventilation, telecom shelter cooling, and large-scale industrial air circulation where volume matters more than extreme pressure.

2. 48VDC Telecom-Ready: Operating on the industry-standard 48VDC with a wide 36~57 VDC input range, this fan integrates directly into telecom DC plants, solar-battery systems, and DC microgrid applications. Drawing 4.65A at 220W, it balances high output with manageable current draw for standard DC distribution.

3. Comprehensive Protection Suite: Soft-start eliminates inrush current. Active current limitation protects windings. Under/over voltage detection guards against unstable supplies. Dual thermal overload sensors monitor motor and electronics independently. Locked-rotor detection prevents mechanical damage. Reverse polarity protection prevents wiring errors.

4. Certified & Durable: CE, RoHS, ISO9001, ErP2026 certified. Die-cast aluminum housing with IP44 rating. Ball bearings rated for 50,000+ hours L10. -25°C to 60°C operating range. EN ISO 12100, EN 60204-1, and EMC compliant.

5. Flexible Integration: 0-10VDC/PWM control with FG tach (3 pulse/rev). Modbus RTU RS485 optional. OEM/ODM with custom voltage, connectors, cable lengths. 7-day samples, 14-21 day production.

FAQ

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.