... coal fired boiler,steam boiler,waste heat recovery boiler,,,,and various boilers. 2.Structure Centrifugal fan mainly consist of ... can be made in accordance with the clockwise and counterclockwise with 0°,45°,90°,135°,180°,225°4. Product Characteristics ... vane damper, damper, electric actuator, motor with variable frequency and speed regulation, frequency converter, soft starter for motor;-Impeller ...