| 摘要 |
A damper arrangement wherein a damper blade opens and closes a flow through orifice in a plate in response to actuating means for moving the blade relative to the orifice, the damper blade including an opening therein in communication with the orifice, the actuating means cooperating with a vent means to provide venting through the plate by way of the opening prior to moving the blade relative to the orifice. |
