... balancing tested Impellers 2.High efficiency,Easy installation 3.ISO9001 T4-72 Centrifugal Fan 1. ApplicationsT4-72 Centrifugal Fan are ... Parts: flexible coupling, variable inlet vane damper, damper, electric actuator, motor with variable frequency and speed regulation, frequency converter, soft ... and frequencymedium temperature and desityaltitude of operation place ... T4-72 Centrifugal Fan