FB3G225-24PL-91 DC Backward Centrifugal Fan, 24VDC, 225mm, 1579.9 m3/h

Brief Description</p

The FB3G225-24PL-91 is a 24VDC high-static-pressure DC backward centrifugal fan that uniquely combines industrial-grade performance with low-voltage safety. Operating on standard 24VDC battery or solar power, it delivers an impressive 1579.9 m³/h maximum airflow and 805 Pa static pressure at just 180W — performance metrics typically achievable only with 48V or higher DC systems. This exceptional pressure-to-voltage ratio is achieved through a precision backward curved impeller paired with a BLDC92 brushless motor, ensuring high efficiency across a wide 16-28 VDC input range. The built-in FG tach output provides real-time speed feedback at 3200 RPM for closed-loop control in automation systems, compatible with both 0-10VDC analog and PWM digital control signals. With IP44-rated ingress protection, Class B insulation rated to 130°C, and a 50,000-hour L10 service life at 40°C, this fan is engineered for demanding environments. Ideal applications include battery-powered air filtration, solar-driven greenhouse ventilation, telecom shelter cooling, mobile HVAC, electric vehicle thermal management, and off-grid equipment enclosures. CE and RoHS certified.

Product Specification</p

At the heart of the FB3G225-24PL-91 is a BLDC92 external rotor brushless DC motor driving a backward curved centrifugal impeller with a diameter of 225mm, precision-balanced for smooth operation at 3200 RPM. The aerodynamic design achieves 75-80% efficiency, converting just 180W of DC power into 1579.9 m³/h of airflow at up to 805 Pa static pressure — a 30-40% energy saving compared to equivalent AC centrifugal fans. The motor's wide 16-28 VDC operating range ensures stable performance even with fluctuating battery voltage, making it suitable for solar-direct and battery-buffered DC systems. Its comprehensive control interface accepts 0-10VDC analog signals and PWM (1-10kHz) digital inputs for stepless speed regulation, while the FG (frequency generator) tachometer output delivers real-time RPM feedback for PLC, microcontroller, or building automation system integration. Built-in protection features include soft-start, current limiting, locked-rotor protection, and reverse polarity protection on the DC input. The fan construction features a die-cast aluminum housing with IP44-rated sealing against water splashes and solid objects larger than 1mm. Ball bearings support any mounting orientation, and Class B electrical insulation permits safe operation in ambient temperatures up to 130°C. The fan is rated for 50,000 hours L10 lifespan at 40°C ambient, with minimal maintenance requirements owing to the brushless motor design. This model is exceptionally well-suited for systems where high static pressure must be delivered from a low-voltage DC power source without compromising reliability or control precision.

Nominal Date

DC Backward Centrifugal Fan
Type	FB3G225-24PL-91
Model	BLDC92

Connection diagram

Remarks:

I. Standard lead wire length is 300mm; customized length available upon request.

II. Control via 0-10VDC analog signal or PWM digital signal.

Product drawing

Aerodynamic Performance Charts

Test condition:

I. Measurement performed according to ISO 5801, using double chamber method.

II. Test voltage: 24VDC, 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.

Safety Requirements

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

Advantages

1. High Static Pressure at Low Voltage: The FB3G225-24PL-91 achieves 1579.9 m³/h at 805 Pa with only 180W on 24VDC — delivering industrial-grade static pressure from standard low-voltage DC power without step-up converters.

2. Superior Aerodynamic Efficiency: 75-80% aerodynamic efficiency through precision backward curved impeller design, representing 30-40% energy savings compared to equivalent AC centrifugal fans.

3. Wide Application Range: Ideal for telecom shelter cooling, solar-powered greenhouse ventilation, battery-operated air filtration, mobile HVAC units, and off-grid equipment enclosures. Available for OEM/ODM customization.

4. Sustainable Development: EC brushless motor technology reduces energy consumption by over 30% versus AC alternatives. IP44-rated housing and 50,000-hour L10 lifespan at 40°C minimize replacement waste and operational cost.

5. Easy Installation and Maintenance: Standard mounting flange compatible with common duct sizes. 0-10VDC/PWM control input and FG tach output enable plug-and-play integration. Maintenance-free BLDC motor requires no brush replacement.

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.