Features: 1, multi-blade wind turbine, high-speed balancing correction, air volume, low noise 2, wind shell for precision molding and electrophoresis, attractive appearance 3, with certified high-efficiency motors, direct installation, stable performance 4, the outlet side turn round accompanying accessories, installation can be multi-angle adjustment to 5, duct optimization design, energy-saving effect 6, fans can do special materials, do not deal with special properties, such as variable speed 7, the fan motor match Can be customized different frequencies or different voltage, AC or DC.