We are specialized in the development, research and production of EC Centrifugal Fan For Roof Ventilator, Shaded Pole Single Phase Motor, Square Shaded Pole Unit Bearing Motor, and we have accumulated rich experience with advanced processing equipment and complete testing methods. We will further increase our efforts to optimize our products, so that our products will be on the next level in terms of quality, delivery time and service. We strengthen job incentives, mobilize and bring into play the potential of employees, and continuously stimulate the endogenous power of enterprise development. Our company's development is achieved through continuous research, investment, and technological innovation. The company has always adhered to the people-oriented original design, the quality of attention to detail and the collocation and combination of products are rich in product categories.
Production description
| The diameter of Impeller | 560mm | |
Material | Impeller | PA plastic 66, fibre glass-reinforced |
Rotor | Coated in black plastic | |
Direction of rotation | Clockwise, seen on rotor | |
Counter-Clockwise, seen on rotor | ||
Type of protection | IP44 or IP54 | |
Insulation class | Class B or Class F | |
Mounting position | Shaft horizontal or rotor on bottom; rotor on top on request(Any) | |
Condensate discharges | Rotor-side | |
Approvals | CE, CCC,UL and so on | |
Mode of operation | Continuous operation(S1) | |
Bearings | Maintenance- free ball bearings | |
Motor protection | Design with thermal overload protector | |
Cable exit | variable, lateral | |
Ambient temperature | -20℃ to 60℃ | |
Advantage | YWF series centrifugal fan with external motor has features of compact structure,convenient installation, credible running, little noise, energy saving and high efficiency. | |
Performance parameters
| Model | Voltage | Frequency | Current | Input Power | Speed | Max Air Flow | Capacitor | Noise |
YWFB4D560 | 400Y | 50 | 2.95 | 1800 | 1380 | 10250 | 85 | ① |
YWFB6D560 | 400Y | 50 | 1.4 | 620 | 920 | 7300 | 72 | ② |


Product feature and application
(1) Product feature:
●Compact structure
●Specialized design
●Refined process control
●Simple Installation
●High efficiency and low noise
●Long service life
(2)Application
●Condenser
●Evaporator
●Pipe fan
●Roof ventilator
●Heat dissipation and ventilation
Production details

The Research and Development Center
The Research and development center of Ningbo Lionball Ventilator Co., Ltd is a national R&D center. It is appraised as High-tech Enterprises and Engineering Technology Center and has obtained many important prizes in the provincial projects.
Research and development center currently has 25 staff members. We introduced Germanic technology and employed a well-paid fan expert as our technical adviser. What is more, we have cooperated with international renowned enterprise EMERSON for about 5 years and will hand in hand with Carrier China.
Research and development center are facilitated with modern equipment and advanced laboratories: Air flow laboratory and life testing laboratory. We provide each member with professional inspection equipment for better research environment.
Over the past two years, owing to continuous effort of R&D team, we have successively obtained 15 certificates of Utility Model patent and 2 certificates of Invention Patents.
(1)Our Certificates of Utility Model Patent




(2)Certificates of Invention Patent

Difference between forward centrifugal fan
(1)efficiency: the efficiency of the forward leaning centrifugal fan is lower than that of the backward leaning centrifugal fan.
(2)energy consumption: because the efficiency of the forward leaning centrifugal fan is low, its natural consumption for electric energy is greater than that of the backward leaning type.
(3)noise: when the forward leaning centrifugal fan is in operation, the noise emitted by the forward leaning centrifugal fan is larger than that of the backward leaning fan.
We are a company integrating R&D, production and distribution, and provides Pole-Changing Multi-Speed Motor Type Yd112m-8/4p Pole 1.5/2.4kw Dual-Speed AC Motor to customers around the world. At present, we have established cooperative relations with customers in many countries. Our service is based on tracking service to ensure the interests of customers and we have won the favor of the majority of users relying on excellent quality and service over the years. The company uses rigorous management, leading technology, high-quality materials, first-class equipment, superb technology, fine workmanship, and outstanding performance to create tangible quality classics and unparalleled service models for customers at home and abroad. Feel our extraordinary service.
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