Vent for toilet

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PrecisionPlum

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Jul 9, 2017
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Why is a 2" line needed for a WC vent? I thought it could be 1/2 of the dia. of the drain line being vented.
So if a WC is on a 3" line, wouldn't the vent only be 1-1/2"?

Note: IPC code in my area.
 
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