FW3G250-48GS-91 Axial Fan, 48VDC, 250mm, 2246.7 m3/h

When a single axial fan must move massive volumes of air while operating on a standard -48VDC telecom bus, the FANOVA FW3G250-48GS-91 delivers an uncompromising performance envelope. This 250mm galvanized steel impeller fan generates a maximum airflow of 2246.7 m³/h, a figure that often eliminates the need for multiple smaller fans in a parallel array, thereby simplifying your mechanical design and reducing total system cost. At 48VDC (36~57V input range), it integrates directly with telecom rectifiers, DCIM infrastructure, and battery-backed power plants without any DC-AC conversion losses. The brushless DC motor consumes only 136W at 3200 RPM, achieving a static pressure of 350 Pa, which is sufficient for moderate duct resistance and filter loading. With protection features including reverse polarity, overcurrent, and locked-rotor safeguards, this fan is engineered for continuous duty in harsh environments. The die-cast aluminum housing and galvanized steel impeller guarantee corrosion resistance and mechanical robustness for industrial HVAC, solar energy storage cabinets, and data center cooling. Operating noise is rated at 74 dB(A), a balance between high airflow and acceptable acoustic performance for equipment rooms and outdoor telecom shelters. The 20AWG cable provides a secure connection for 2.85A current draw, and the fan meets CE and RoHS standards, making it a trusted OEM/ODM choice from FANOVA for global deployments. Whether you are upgrading legacy AC fans or designing new DC-powered ventilation systems, this model offers a compact, high-throughput solution with a long bearing life designed for 50,000+ hours of maintenance-free operation.

The FANOVA FW3G250-48GS-91 is a high-performance axial fan engineered for applications where large volumetric flow and 48VDC power distribution converge. The impeller, with a diameter of 250mm, is fabricated from galvanized steel sheet (Q235 hot-dip galvanized), offering superior mechanical strength, wear resistance, and protection against atmospheric corrosion, making it ideal for continuous industrial operation. The seven-blade forward-curved design is optimized for low-turbulence airflow, achieving a maximum flow rate of 2246.7 m³/h (1322.2 CFM) at free-air conditions, and a peak static pressure of 350 Pa (1.4 In.wg), which supports extended duct runs and moderate high-efficiency particulate air (HEPA) pre-filters. The impeller is dynamically balanced to G2.5 grade, ensuring vibration-free rotation and extended bearing life even at the rated 3200 RPM.

Power is provided by a brushless DC motor with a 92mm rotor diameter, specifically wound for 48VDC operation with a permissible input voltage range of 36 to 57VDC. This wide range accommodates battery voltage sag and float charging conditions common in telecom and industrial DC bus systems. The motor draws a maximum current of 2.85A, corresponding to a nominal input power of 136W. The motor uses a sensorless sinusoidal drive topology, reducing electromagnetic interference and acoustic noise, while delivering a high overall efficiency exceeding 85% at the operating point. Speed control is implemented via 0-10V analog input or PWM frequency (25kHz) signal, allowing external controllers to modulate airflow from 0% to 100% for VAV (variable air volume) systems or thermal management strategies. The control interface is compatible with standard DC fan speed controllers, enabling seamless integration into building management systems (BMS) or custom IoT controllers.

Electrical protection includes reverse polarity protection, overcurrent limiting, locked-rotor auto-restart, and soft-start to prevent inrush current spikes. The motor insulation class is Class B (130°C), suitable for ambient temperatures up to 60°C, and the fan is rated for a lifetime of 50,000 hours at 40°C ambient, thanks to dual ball bearings (one deep-groove, one self-aligning) that handle radial and axial loads effectively.

The housing and endcaps are precision die-cast aluminum alloy (ADC12), providing excellent heat dissipation and dimensional stability. The fan is designed for flange mounting (with M4 threaded holes) and weighs approximately 2.8kg. The electrical connection is a 20AWG lead wire, 300mm long, with stripped and tinned ends, rated for 105°C, ensuring compatibility with standard terminal blocks. For safety, the fan meets CE (LVD and EMC directives) and RoHS compliance, and each unit is subjected to a 100% run-in test at the factory, which includes verification of airflow, static pressure, current, and vibration levels.

This model is particularly suited for telecom base stations (where -48VDC is the standard supply), solar photovoltaic DC microgrids, energy storage cabinet ventilation, and industrial control panels where high airflow and DC power efficiency are paramount. The galvanized steel impeller provides a cost-effective yet durable solution for dirty air streams, and the aluminum housing resists corrosion in coastal or humid environments. For OEMs seeking a drop-in replacement or new design, the FW3G250-48GS-91 offers a scalable platform with customizable cable length, connector options, and speed control algorithms, all backed by FANOVA's ISO9001 manufacturing and in-house dynamometer testing.

DC Axial Fan
Type	FW3G250-48GS-91
Model	BLDCDC92

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 FW3G250-48GS-91 delivers 2246.7 m3/h at 350 Pa while drawing only 136W, achieving 30-40% energy savings over equivalent AC fans through FANOVA's BLDC motor technology.

2. Industrial-Grade Impeller: The 250mm 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 250mm 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.