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。

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Caps shall comply with the performance requirements of Cap Size, Ventilated Caps Vent Area or Ventilated Caps Air Flow.

笔帽应执行笔帽规格，通气帽的通风区域或通气帽的空气流量的要求。

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Caps shall comply with the requirements of Cap Size, Ventilated Caps Vent Area or Ventilated Caps Air Flow.

笔帽应执行笔帽尺寸，笔帽透气区域或笔帽通风气流的要求。

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Large parts of the City of Ann Arbor and parts of Scio Township have now been placed in a Groundwater Use Prohibition Zone (PZ) by the court, as the plume is now being allowed to flow through the city to vent into the Huron River.

FORBES: Responsible Investing: Is Pall 'Leading' in Water Filtration? (Governor Snyder's Hometown has a 1,4 Dioxane Problem)