FB3G355-2AAS-30 Backward Curved Centrifugal Fan, 230VAC, 355mm, 5807 m3/h

The FB3G355-2AAS-30 is a high-performance backward centrifugal fan engineered to deliver exceptional airflow and static pressure in demanding HVAC and industrial ventilation systems. With a maximum airflow of 3417.4 CFM (5807 m³/h) and a peak static pressure of 3.66 in.wg (914 Pa), this fan replaces multiple smaller units, simplifying system design and reducing footprint. Powered by a 230VAC BLDC EC motor (model BLDCEC137) with a wide input range of 184 to 270V, it offers true plug-and-play operation for retrofitting existing AC installations. The motor draws only 4.57A at 1050W, delivering energy-efficient performance with a noise level of 84.5 dB(A). The 355mm die-cast aluminum impeller ensures robust durability and corrosion resistance, making it ideal for continuous heavy-duty operation. This fan features variable speed control via 0-10VDC or PWM signals, enabling precise airflow modulation for demand-based ventilation. It is equipped with thermal protection and Class F insulation, while the dual ball bearings provide a long service life of over 50,000 hours. Typical applications include AHUs, cleanrooms, data centers, and industrial exhaust systems requiring high static pressure. Certified to CE and RoHS standards, this FANOVA model is a reliable choice for OEM and ODM projects worldwide.

The FB3G355-2AAS-30 represents a pinnacle in backward centrifugal fan engineering, combining a large 355mm impeller diameter with a high-efficiency BLDC EC motor to achieve superior aerodynamic performance. The impeller is constructed from die-cast aluminum alloy, featuring a backward-curved blade design that minimizes turbulence and maximizes pressure generation. This construction ensures excellent resistance to corrosion and fatigue, even in harsh industrial environments with airborne particulates or humidity. The housing and endcaps are equally crafted from die-cast aluminum, providing a rigid, lightweight frame that reduces vibration and structural stress during high-speed rotation at up to 2330 RPM. The motor, designated BLDCEC137, operates on a 230VAC supply with a wide acceptance range from 184V to 270V, accommodating unstable grid conditions. This electronically commutated motor uses a permanent magnet rotor and advanced control electronics to deliver up to 1050W of shaft power with an efficiency that outperforms traditional AC induction motors by up to 30%. Speed control is achieved through a versatile interface supporting both 0-10VDC analog and PWM digital signals, allowing seamless integration with building management systems (BMS) or standalone controllers. The fan's electrical characteristics include a nominal current draw of 4.57A at full speed, with soft-start functionality that limits inrush current to protect the electrical circuit. Thermal protection is built into the motor driver, preventing overheating under overload or blocked-vent conditions, while the winding insulation meets Class F standards for high-temperature resilience. For mechanical reliability, the rotor is supported by a pair of high-grade ball bearings, each pre-lubricated and sealed to ensure a service life exceeding 50,000 hours under typical operating conditions. This bearing configuration also facilitates operation in any mounting orientation, from horizontal to vertical, without compromising performance. The electrical interface consists of a 1000mm long 18AWG cable with tinned leads, providing flexible wiring options for both OEM integration and field replacement. The fan's performance envelope includes a maximum airflow of 3417.4 CFM (5807 m³/h) at free-air conditions and a maximum static pressure of 3.66 in.wg (914 Pa) at zero flow, making it suitable for systems with long duct runs, high-efficiency filters, or multiple outlets. Acoustically, the fan generates a sound pressure level of 84.5 dB(A) at the rated point, a figure that is competitive for its airflow class and can be further reduced by operating at lower speeds. The unit is designed and manufactured under ISO 9001 quality management systems and complies with CE and RoHS directives, ensuring safety and environmental compliance for global markets. With its combination of high flow, high pressure, and EC efficiency, the FB3G355-2AAS-30 is an ideal solution for OEMs seeking a single-fan alternative to multi-fan arrays in confined equipment spaces.

DC Backward Curved Centrifugal Fan
Type	FB3G355-2AAS-30
Model	BLDCEC137

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 FB3G355-2AAS-30 delivers 5807 m3/h at 914 Pa while drawing only 1050W, achieving 30-40% energy savings over equivalent AC fans through FANOVA's BLDC motor technology.

2. Industrial-Grade Impeller: The 355mm 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 355mm 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.