... DT) Blowers abd Fans 1.Dynamic balancing tested Impellers 2.High efficiency,Easy installation 3.ISO9001:20 HTFCf(DT) ... steam boiler,waste heat recovery boiler,,,,and various boilers. 2.Structure Centrifugal fan mainly consist of impeller,case,air ... vane damper, damper, electric actuator, motor with variable frequency and speed regulation, frequency converter, soft starter for motor;-Impeller is adjusted ...