FB3G250-48PL-20 DC Backward Centrifugal Fan, 48VDC, 250mm, 1941 m3/h

The FB3G250-48PL-20 is a 48VDC extreme-static-pressure DC backward centrifugal fan delivering a remarkable 1248 Pa at 1941 m³/h — the highest pressure rating in the entire FANOVA 250mm series. Powered by the BLDC102 brushless motor outputting 420W at 3720 RPM, this fan is purpose-built for telecom infrastructure operating on standard -48VDC power, as well as industrial DC bus systems requiring maximum pressure capability. Drawing 8.75A across a 16-56 VDC input range, it provides exceptional pressure headroom for high-resistance ducted systems, multi-stage HEPA filtration, and long-run industrial extraction. The integrated FG tach output enables precision closed-loop speed control, compatible with 0-10VDC analog and PWM digital control signals for seamless integration into facility management and telecom automation platforms. With IP44-rated ingress protection, Class B insulation to 130°C, and a 50,000-hour L10 service life, this fan is engineered for continuous-duty operation in mission-critical infrastructure. Ideal applications include telecom shelter pressurization and ventilation, data center hot-aisle containment, HEPA-filtered cleanroom HVAC, industrial process extraction, and any application demanding the highest static pressure from a DC power platform. CE and RoHS certified.

At the core of the FB3G250-48PL-20 is the BLDC102 external rotor brushless DC motor — a 420W high-output platform — driving a backward curved centrifugal impeller with a 250mm diameter, optimized for maximum pressure generation at 3720 RPM. The aerodynamic design achieves 75-80% efficiency, converting 420W of 48VDC power into 1941 m³/h at an industry-leading 1248 Pa — static pressure performance that matches or exceeds many 310VDC and 3-phase AC fan installations while operating from standard telecom -48VDC bus power. Operating across a 16-56 VDC range at 8.75A nominal, the BLDC102 maintains stable performance through voltage variations common in battery-backed DC plants and renewable energy storage systems. The comprehensive control interface accepts 0-10VDC analog signals and PWM (1-10kHz) digital inputs for stepless speed regulation, while the FG tachometer output provides real-time RPM feedback for closed-loop integration with PLCs, DCIM (Data Center Infrastructure Management), and building automation platforms. Built-in protection features include soft-start, current limiting, locked-rotor protection, over-temperature protection, and reverse polarity protection. The fan construction features a die-cast aluminum housing with IP44-rated sealing, high-speed ball bearings supporting 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 with minimal maintenance, this fan is the definitive solution for high-pressure 48VDC ventilation applications where extreme static pressure capability is non-negotiable.

DC Backward Centrifugal Fan
Type	FB3G250-48PL-20
Model	BLDC102

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. Extreme Static Pressure for 48VDC Systems: The FB3G250-48PL-20 achieves an industry-leading 1248 Pa at 1941 m³/h on 48VDC — the highest pressure rating in the 250mm FANOVA series. Powered by the 420W BLDC102 motor at 3720 RPM, it delivers pressure performance that matches 310VDC and 3-phase AC systems from standard telecom -48VDC bus power.

2. BLDC102 High-Output Efficiency: 75-80% aerodynamic efficiency at 420W/3720 RPM, achieving 1941 m³/h at 1248 Pa — 30-40% energy savings versus equivalent 3-phase AC fans while operating from existing 48VDC infrastructure without AC inverters or rectifiers.

3. Mission-Critical Applications: Purpose-built for telecom shelter pressurization, data center hot-aisle containment, HEPA-filtered cleanroom HVAC, industrial process extraction, and DC microgrid ventilation. Available for OEM/ODM customization.

4. Continuous-Duty Reliability: Die-cast aluminum IP44 housing, high-speed ball bearings, over-temperature protection, and 50,000-hour L10 lifespan at 40°C ensure uninterrupted operation in 24/7 telecom and data center environments.

5. DCIM-Ready Integration: 0-10VDC/PWM control plus FG tach feedback for DCIM and BMS closed-loop monitoring. Standard 250mm flange, any-orientation mounting, maintenance-free BLDC design.

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.