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Branch vents connecting more than one individual vent to a stack or stack-vent shall be in accordance with Table RS 16-14. The branch vent size shall be based upon the number of fixture units connected thereto, and the developed length of the branch vent measured from its vent stack (or stack-vent) connection to the farthest fixture drain connection served by the branch vent. See Figure RS 16-2.
Figure RS 16-2. Sizing of Branch Vent Piping, Drop Vents to 1st Floor, Basement and Cellar Fixtures.

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