FB3G310-48PK-20 Backward Curved Centrifugal Fan, 48VDC, 310mm, 3135 m3/h

When your ventilation system needs to move serious air without sacrificing energy efficiency, the FANOVA FB3G310-48PK-20 backward centrifugal fan delivers a commanding 3135 m³/h maximum airflow, making it a one-fan replacement for multi-fan setups in high-demand industrial applications. This 48 VDC model operates over a wide 36–57 V input range, aligning perfectly with telecom-standard -48 VDC power plants and modern DCIM (Data Center Infrastructure Management) integration for precise, centralized control. At 2000 RPM and 273.6 W, it generates a robust 543 Pa static pressure, capable of pushing air through long duct runs, high-resistance filters, and multi-outlet plenums with ease. The large 310 mm glass-fiber-reinforced polypropylene impeller achieves high flow at comparatively low speed, reducing airborne noise to a moderate 71 dB(A) while ensuring durability against chemical exposure and moisture. Powered by the BLDCDC102 brushless DC motor, this fan offers variable speed control via PWM or analog signals, delivering energy savings of up to 30% compared to traditional AC fans. Protection features include locked-rotor and reverse-polarity safeguards, while the die-cast aluminum endcaps provide structural rigidity and heat dissipation for long service life. Ideal for HVAC air handlers, telecom shelters, battery storage cabinets, and cleanroom pre-filtration stages, the FB3G310-48PK-20 is CE, RoHS, and UL-certified for global deployment. Choose FANOVA for a heavy-duty, high-flow DC fan that simplifies system design and lowers total cost of ownership.

The FANOVA FB3G310-48PK-20 is a high-performance backward centrifugal fan engineered for demanding ventilation and cooling duties in industrial, telecom, and new energy environments. At its core is a 310 mm diameter impeller fabricated from glass-fiber-reinforced polypropylene (PP+GF), a material selected for its outstanding strength-to-weight ratio, chemical resistance, and dimensional stability under varying humidity and temperature. The backward-curved blades are aerodynamically optimized to minimize turbulence and maximize static efficiency, enabling a peak airflow of 3135 m³/h and a maximum static pressure of 543 Pa at 2000 RPM. This impeller design, combined with a large rotor diameter of 102 mm, allows the fan to operate at a lower rotational speed for its output, which reduces bearing stress and acoustic emissions to 71 dB(A) — a level suited for equipment rooms and occupied spaces. The fan is driven by a BLDCDC102 brushless DC motor, which features an external rotor architecture that dissipates heat efficiently through the die-cast aluminum endcaps and housing. The motor accepts a nominal 48 VDC input with a wide operating range of 36–57 VDC, drawing a maximum current of 5.7 A and consuming 273.6 W at full speed. Speed control is implemented through a 0–10 V analog interface or PWM signal, allowing seamless integration with building management systems, thermostat controllers, or telecom DCIM platforms. For enhanced reliability, the motor includes electronic protection against overcurrent, overvoltage, undervoltage, locked rotor, and reverse polarity, while the winding insulation is rated Class B (130°C) to withstand elevated ambient temperatures. The fan employs dual ball bearings with a design life exceeding 50,000 hours at 50°C ambient, ensuring longevity in continuous-duty applications. The electrical interface is provided via a 20 AWG cable of 164 mm length, pre-terminated for easy hookup to standard connectors. Mechanical construction features die-cast aluminum endcaps that provide robust mounting points and vibration damping, while the entire assembly is balanced to ISO 1940 G2.5 grade. The FB3G310-48PK-20 is suitable for 24/7 operation in telecom shelters, UPS rooms, solar inverter cabinets, and industrial ventilation systems. It complies with CE, RoHS, and UL requirements, and FANOVA's stringent quality control ensures each unit undergoes performance and hi-pot testing before shipment. With its combination of high airflow, moderate static pressure, and low-voltage DC efficiency, this fan is an ideal choice for engineers seeking a compact yet powerful solution for next-generation cooling infrastructure.

DC Backward Curved Centrifugal Fan
Type	FB3G310-48PK-20
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 FB3G310-48PK-20 delivers 3135 m3/h at 543 Pa while drawing only 273.6W, 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.