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If a horizontal branch connects to the stack within 2 feet (610 mm) above or below a vertical stack offset, and the offset is located more than four branch intervals below the top of the stack, the offset shall be vented in accordance with Section 907.
711.1.1 Omission of Vents for Vertical Stack Offsets
Vents for vertical offsets required by Section 711.1 shall not be required where the stack and its offset are sized as a building drain [see Table 710.1(1)].

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Section 711 Sanitary Drainage, Offsets in Drainage Piping in Buildings of Five Stories or More
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