18-29-916.2 Other vents.

The diameter of individual vents, branch vents and relief vents shall be at least one-half the required diameter of the drain served. The required size of the drain shall be determined in accordance with Article 7. Vent pipes shall not be less than 1 1/2 inches (40 mm) in diameter. Vents exceeding 40 feet (12.19 m) in developed length shall be increased by one nominal pipe size for the entire developed length of the vent pipe. Relief vents for soil and waste stacks in buildings having more than 10 branch intervals shall be sized in accordance with Section 18-29-914.2.

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