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main circuit vent /ˈmeɪn ˈsɜːkɪt ˈvɛnt/ n

中文：主通气立管

中文 · 主通气立管Español · toma de aire principalFrançais · colonne de ventilation principale
Meaning：Vertical pipe vented directly outdoors that allows air to circulate throughout the draining circuit; it also vents sewer gas.
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House plumbing system

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