louvered exhaust fans 1)Centrifugal system 2)high quality,low noise 3)Big ... )Copper motor Ventilation fan, axial ventilation fan,ventilator, louvered exhaust fans, greenhouse ventilating systemWe are a professional manager for more than ... the workshop.Ventilating fan is applicable for these areas: 1. Industrial field: textile, clothes making, glass, rubber, food processing, etc.2 ...