Each damper is a short sheet metal vent pipe fitted with a circular damper plate within the vent pipe, and attached to a square anchor plate.
每一个节气阀都是由一个短的金属片的排气管再安装上圆形的风挡，然后粘上真方形的固定板制成的。
The damper plate rotates around an axis rod to control the flow of air through the vent pipe.
这个风挡通过中心轴控制旋转来让通过排气管的空气流动起来的。
The system uses a vent fan, a manually adjustable backpressure damper, a differential pressure-sensing gage, and an inlet air filter high differential pressure alarm switch.
此系统用一个排气扇，手动调节反压闸，压差传感器和一个进气过滤器压差高报警开关。
The system uses a vent fan, a manually adjustable backpressure damper, a differential pressure-sensing gage, and an inlet air filter high differential pressure alarm switch.
此系统用一个排气扇，手动调节反压闸，压差传感器和一个进气过滤器压差高报警开关。
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