When the disturbance can be preset disturbance Angle, so that the pipeline strength; With different longitudinal/circumferential distribution;

The wall thickness of the pipe can be preset, so that the FRP fan duct can withstand different internal and external pressures;

Materials can be preset to achieve different corrosion resistance, flame retardant and dielectric targets;

Preset form can be implemented, suitable for different installation conditions, improve the speed of engineering installation.

The effect of cooling and precipitation is covered by the FRP fan with short ventilation time and high energy consumption. The fan is not well handled and is prone to condensation.