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Is main vent required regardless of the number of vent connected to the building drain and what determines the size of the main vent?

April 26, 2017building connected drain main regardless size vent

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Is main vent required regardless of the number of vent connected to the building drain and what determines the size of the main vent?

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No, the main vent may be a single vent stack or a stack vent, or any stack vent or vent stack that is connected to the building drain may be considered as the main vent and thus fulfill the requirement of P3102.1. 1)Section P3113.1 shall determine the size of the main vent and states that vent pipes shall be equal to one-half the diameter of the drain served. And the drain shall be sized in accordance with Chapter 30 of the IRC. But, the vent shall be a minimum of 1 ¼ inches diameter. Any vent that exceeds 40 feet of developed length shall be increased by one (1) nominal pipe size for the entire length of the vent.