... fired boiler,steam boiler,waste heat recovery boiler,,,,and various boilers. 2.Structure Centrifugal fan mainly consist ... damper, damper, electric actuator, motor with variable frequency and speed regulation, frequency converter, soft starter for motor;-Impeller ... volume/air flowtotal pressure or static pressurevoltage and frequencymedium temperature and desityaltitude of operation place ... KKF Fan ...