Shutter Cone Fan (Push-pull Opening System)

Shutter Cone Fan (Push-pull Opening System) ● Push-pull Opening System: Use push-pull opening system to completely open and close shutters, minimize the wind resistance and greatly improve the operating efficiency; with extended cone design to guarantee that it can achieve high wind pressure, low energy consumption and big air flow in tunnel ventilation condition. ● Cone: Adopt new design, plug type connection, not need many bolts and nuts for tightening as before, reducing