Found in ductwork, a damper consists of a movable plate (or numerous plates), plunger, or bladder that opens and closes to regulate airflow. Dampers are used to regulate airflow to certain rooms. 存在于管道系统， 由一块或多块可移动的平板 （或多个平板） 、 活塞、 袋子组成，这些部件通过开关来调节气流量。风门用于调节某一室内空间的气流。
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