... fan seat 风机底座 vent flap 通风盖 louver with storm cover 带风雨密盖百叶窗 ...
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vent flap
排气瓣
以上为机器翻译结果，长、整句建议使用 人工翻译 。
These valves use a screw type valve instead of a simple flap, and they have a pressure regulating mechanism that will vent water to the ground if the intake pressure exceeds a set level.
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