... torsion: CE, ISO9001,RoHS Damper Actuator(Fan Actuator, Actuator, Driver, Fan Damper Actuator)TA/TD Series Damper Actuatos are the special design ... for control fan in HVAC system. The ... supplies 2-40 Nm torsion, and couldbe installed to the fan flow, ventilation window, VAV and other equipments directly, adjust ...