In the era of knowledge economy characterized by information technology, guided by knowledge and aimed at enhancing core competitiveness, the effective acquisition, accumulation and use of knowledge is the driving force for our company to develop Single Inlet Forward Centrifugal Fan, 4 inch inline fan, UL Approval Steel Type Circular Duct Fan CDF Serie with independent intellectual property rights and improve its competitiveness. While vigorously developing the economy, we always adhere to the development concept of "lucid waters and lush mountains are invaluable assets". We have developed a senior management team with a high level of knowledge, strong management skills and experience. Our service team can provide professional services in the shortest time to help customers solve problems in a timely manner. We invest heavily in research and development and cooperate with partners. We continue to innovate and explore new production technologies to meet the different needs of customers.
Product Introduction
| The diameter of the fan blade | 550mm | |
Material | Guard Grill | steel, phosphated and coated in black plastic |
Wall ring | sheet steel, galvanized and coated in black plastic | |
blades | sheet steel | |
Rotor | encased in aluminium | |
Number of blades | 5 | |
Direction of rotation | Suction—direction of air flow "S" counter-clockwise, | |
Blowing—direction of air flow "B" clockwise seen on rotor | ||
Type of protection | IP54 or IP44 | |
Insulation class | Class B or Class F | |
Approvals | UL, CE, CCC , ROHS and so on | |
Mode of operation | Continuous operation(S1) | |
Bearings | Maintenance- free ball bearings | |
Ambient temperature | -30℃ to 60℃ | |
Motor protection | without TOP, TOP wired internally | |
Cable exit | lateral | |
Protection class | I | |
Advantage | YWF series axial fan with high static pressure and large air flow, have single phase, three phase, and different voltage levels, and 50HZ, 60HZ, according to the client’s different needs. | |
product Parameter (specification)
(1)For Air Compressor:
YWF550 usually use in air compressor of 22-30 KW
| Model | Voltage | Frequency | Current | Input Power | Speed | Max Air Flow | Capacitor | Noise |
YWF4D550 | 380 | 50 | 1.35 | 600 | 1300 | 9700 | / | 76 |
(2)For Refrigeration and others:
| Model | Voltage | Frequency | Current | Input Power | Speed | Max Air Flow | Capacitor | Noise dB(A) | Model |
YWF4E550 | 230 | 50/60 | 2.2/3.1 | 500/710 | 1320/1500 | 8250/8700 | 16 | 76/80 | ①② |
YWF4D550 | 400Y | 50/60 | 1.1/1.3 | 480/700 | 1320/1500 | 8250/8700 | / | 76/80 | |
YWF6E550 | 230 | 50/60 | 1.15/1.55 | 230/335 | 940/1100 | 5400/6400 | 10 | 66/71 | ③④ |
YWF6D550 | 400Y | 50/60 | 1.1/0.92 | 290/345 | 940/1100 | 5400/6400 | / | 66/71 |


Product feature and application
(1) Product feature:
●Compact structure
●Specialized design
●Refined process control
●Simple Installation
●High efficiency and low noise
●Long service life
Application
Ventilation | Buildings, parking lots and so on |
Refrigeration | Refrigerator, Air cooler, refrigerating machine and so on |
Heat dissipation | HAVC, Air compressor, Dehumidifier, Evaporator, Wall fan, Condenser, Dryer, AHU, Ice machine and so on |
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 EngineeringTechnologyCenter 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

Based on the premise of technological innovation and improvement of our 225X225X80mm DC Axial Cooling Fan with Large Airflow and High Pressure, we continue to surpass and improve ourselves, and have been supported and trusted by our customers. We have always insisted on doing our social responsibility as a corporate citizen for the progress of society, the prosperity of the nation and the strength of the country. We promote results through innovation, seek development through reform, and hope to achieve more long-term development.
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