EN
FB3G133-48PL-70
| Nominal Voltage | VDC | 48 |
| Current draw | A | 0.6±10% |
| Speed(RPM) | min-1 | 3800±5% |
| Power consumption | W | 28±10% |
| Max. Air Flow | CFM / m3 /H | 235/400 |
| Max. Static Pressure | In.wg /Pa | 1.316/329 |
50pcs
The FB3G133-48PL-70 is an ultra-quiet, ultra-efficient DC backward curved centrifugal fan designed for noise-sensitive 48VDC applications. Its BLDC72 brushless motor consumes just 28W while delivering 400 m³/h (235 CFM) at 329 Pa—achieving class-leading energy efficiency in the compact 133mm form factor. At only 63 dB(A), it operates quieter than a normal conversation, making it ideal for medical equipment, laboratory ventilation, office HVAC, and residential air systems where acoustic comfort is critical. The 48VDC input with 36~57 VDC range is compatible with telecom DC plants, solar-battery systems, and PoE-based power distribution. 0-10VDC/PWM speed control with FG tach (2 pulse/rev) enables precision airflow regulation. CE, RoHS, ISO9001, ErP2026 certified with 50,000-hour L10 bearing life.
At the core of the FB3G133-48PL-70 is the BLDC72 permanent magnet brushless external rotor motor, optimized for low-noise operation through precision-balanced rotor dynamics and sinusoidal drive commutation. Drawing just 0.6A at 48VDC, it produces 28W to spin the 7-blade glass-fiber reinforced PP impeller at 3800 RPM, generating 400 m³/h at 329 Pa. The wide 36~57 VDC input accommodates battery charge/discharge voltage swings without performance degradation. The die-cast aluminum housing provides effective heat dissipation and IP44 protection. Ball bearings rated for 50,000+ hours support any-angle mounting. The integrated controller includes soft-start, current limitation, under/over voltage detection, thermal overload, locked-rotor protection, and reverse polarity protection. The FG tachometer output (2 pulse/rev) enables closed-loop speed verification. Compliant with CE, RoHS, ISO9001, ErP2026 and international EMC, mechanical, and electrical safety standards.
| DC Backward Centrifugal Fan |  |
|
| Type | FB3G133-48PL-70 | |
| Model | BLDC72 | |
| Nominal Voltage | VDC | 48 |
| Voltage range | VDC | 36~57 |
| Current draw | A | 0.6±10% |
| Speed(RPM) | min-1 | 3800±5% |
| Power consumption | W | 28±10% |
| Sound Pressure Level | dB(A) | 63±5% |
| Max. Air Flow | CFM / m3 /H | 235/400 |
| Max. Static Pressure | In.wg /Pa | 1.316/329 |
| Insulation class | ~ | Class B |
| Degree of protection | ~ | IP44 |
| Control Input | ~ | 0~10VDC / PWM |
| Signal Output | ~ | FG (Tach output ) |
Remarks:
I. Standard cable length. The length of cable can be customized.
II. Conventional mode is 0-10V/PWM control. Modbus RTU over RS485 is available as an option.
Test condition:
I. The test data is obtained under the specified environment conditions and installation mode.
II. Input Voltage---Operating voltage.
III. Temperature---Room temperature 25°C.
IV. Humidity---65%RH.
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. Ultra-Quiet 63dB Operation: At just 63 dB(A), the FB3G133-48PL-70 is one of the quietest fans in its class—quieter than normal conversation. The precision-balanced rotor, sinusoidal drive commutation, and optimized blade geometry work together to minimize tonal noise and broadband turbulence, making it suitable for medical equipment, laboratory fume hoods, library HVAC, and premium residential ventilation where acoustic performance directly impacts occupant comfort and equipment functionality.
2. Ultra-Efficient 28W: Consuming only 28W while delivering 400 m³/h at 329 Pa, this fan achieves exceptional energy efficiency—ideal for battery-backed, solar-powered, and energy-conscious applications. Drawing just 0.6A from a 48VDC supply, it maximizes runtime on limited power budgets. The BLDC72 EC motor converts over 80% of input power into useful airflow, compared to 40-60% for equivalent AC shaded-pole fans.
3. Comprehensive Protection Suite: Soft-start, current limitation, under/over voltage detection (36~57 VDC), independent thermal overload for motor and electronics, locked-rotor protection, and reverse polarity protection ensure reliable unattended operation in remote and critical installations.
4. Compact & Durable: The 133mm form factor with die-cast aluminum housing and IP44 rating fits tight enclosures. Ball bearings rated for 50,000+ hours L10. -25°C to 60°C operating range. CE, RoHS, ISO9001, ErP2026 certified with EN ISO 12100, EN 60204-1, and EMC compliance.
5. Precision Control: 0-10VDC/PWM speed control from 0-3800 RPM with FG tach feedback (2 pulse/rev). Modbus RTU RS485 optional. Custom voltage, connector, and cable lengths available. 7-day samples, 14-21 day production.
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.
