| 摘要 |
A motorized control damper having at least one damper blade mounted to a drive journaled within a framework. An electric motor is directly connected to one end of the drive shaft on one side of the framework and a return spring connected to the other end of the drive shaft, preferably concentrically. Operation of the electric motor opens the damper blade by rotation of the drive shaft. Upon de-energization of the electric motor, the return spring counter rotates the drive shaft to close the damper blade.
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