FB3G310-48AL-21 Backward Curved Centrifugal Fan, 48VDC, 310mm, 2813.5 m3/h

When a ventilation task demands both massive airflow and the ability to punch through high-resistance ductwork, the FB3G310-48AL-21 emerges as a standout performer in the backward centrifugal fan category. Engineered around a 310 mm die-cast aluminum impeller, this 48 VDC unit delivers a peak airflow of 2813.5 m³/h (1655.7 CFM) while generating a maximum static pressure of 874 Pa (3.5 in.wg), making it ideal for long duct runs, high-efficiency filters, and multi-outlet distribution systems. The fan is powered by a robust BLDCDC102 brushless DC motor rated at 375 W, operating at a nominal speed of 2600 RPM with a current draw of 7.8 A. Its 48 VDC input (36–57 V range) aligns perfectly with telecom-standard -48 VDC power plants, enabling seamless DCIM integration and battery backup scenarios. The motor features PWM speed control for precise airflow modulation, while the all-aluminum construction ensures corrosion resistance and thermal stability in demanding industrial environments. With a sound level of 76 dB(A), it balances power with acceptable noise for mechanical rooms, and the dual ball bearing system guarantees a long service life under continuous duty. This fan is fully certified with CE and RoHS, and its IP55-rated housing (optional) protects against dust and water jets. Whether applied in telecom shelters, renewable energy storage enclosures, or heavy-duty HVAC systems, the FB3G310-48AL-21 offers a single-fan solution that replaces multiple smaller units, reducing complexity and total cost of ownership.

The FB3G310-48AL-21 is a high-performance backward curved centrifugal fan designed for applications where high static pressure and large volume airflow are critical. The impeller is fabricated from die-cast aluminum alloy (ADC12), featuring a backward curved blade geometry that optimizes aerodynamic efficiency and reduces turbulence. With a 310 mm diameter and 11 blades, the impeller achieves a maximum airflow of 2813.5 m³/h at free delivery, with a maximum static pressure of 874 Pa at zero flow, operating at a rated speed of 2600 RPM. The fan housing and endcaps are also die-cast aluminum, providing excellent dimensional stability, corrosion resistance, and heat dissipation. The motor is a BLDCDC102 brushless DC motor with a nominal input voltage of 48 VDC (operating range 36–57 VDC), rated current of 7.8 A, and power consumption of 375 W. The motor utilizes a sensored commutation scheme for reliable startup and smooth torque output across the full speed range. Speed control is achieved via PWM signal or 0–10 VDC analog input, allowing external controllers to modulate airflow precisely. The fan includes an integrated speed sensor (FG output) and a locked rotor protection function, with automatic restart after fault removal. The motor is protected against overvoltage, undervoltage, overcurrent, and overheating through embedded electronics. Insulation class is Class B (130°C), and the fan is rated for ambient temperatures from -20°C to +60°C. The dual ball bearing system (deep groove ball bearings) is designed for a service life of 50,000 hours at 40°C ambient, ensuring long-term reliability. The electrical interface consists of a 20 AWG cable with a length of 120 mm, terminated with bare leads for easy connection. The fan is certified to CE, RoHS, and UL (under evaluation), and can be optionally supplied with an IP55-rated housing for outdoor or washdown environments. Quality control includes 100% run-in testing and balancing per ISO 1940 G2.5 grade, ensuring low vibration and noise levels. The fan is suitable for telecom base stations, battery energy storage systems (BESS), clean rooms, and industrial ventilation systems that demand high pressure and high flow.

DC Backward Curved Centrifugal Fan
Type	FB3G310-48AL-21
Model	BLDCDC102

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 FB3G310-48AL-21 delivers 2813.5 m3/h at 874 Pa while drawing only 375W, achieving 30-40% energy savings over equivalent AC fans through FANOVA's BLDC motor technology.

2. Industrial-Grade Impeller: The 310mm 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 310mm 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.