18-29-914 Relief Vents – Stacks of More Than 10 Branch Intervals.

18-29-914.1 Where required.

   Soil and waste stacks in buildings having more than 10 branch intervals shall be provided with a relief vent at each tenth interval installed, beginning with the top floor.

18-29-914.2 Size and connection.

   The size of the relief vent shall be equal to the size of the vent stack to which it connects. The lower end of each relief vent shall connect to the soil or waste stack through a wye below the horizontal branch serving the floor, and the upper end shall connect to the vent stack through a fitting not less than 42 inches (1067 mm) above the floor.

(Amend Coun. J. 11-8-12, p. 38872, § 370; Amend Coun. J. 10-14-21, p. 37722, Art. IX, § 5)

18-29-915 Vents for Stack Offsets.

18-29-915.1 Vent for horizontal offset of drainage stack.

   Horizontal offsets of drainage stacks shall be vented where five or more branch intervals are located above the offset. The offset shall be vented by venting the upper section of the drainage stack and the lower section of the drainage stack.

(Amend Coun. J. 10-14-21, p. 37722, Art. IX, § 6)

18-29-915.2 Upper section.

   The upper section of the drainage stack shall be vented as a separate stack with a vent stack connection installed in accordance with Section 18-29-903.4. The offset shall be considered the base of the stack.

18-29-915.3 Lower section.

   The lower section of the drainage stack shall be vented by a yoke vent connecting between the offset and the next lower horizontal branch. The yoke vent connection shall be permitted to be a vertical extension of the drainage stack. The size of the yoke vent and connection shall be a minimum of the size required for the vent stack of the drainage stack.