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Section P-1103 Protection of Trap Seals
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A vent stack or main vent shall be installed with a soil or waste stack when relief vents or other branch vents are required in more than five branch intervals. The vent stack shall terminate independently in the open air above the roof or shall be connected with the stack vent at least 6 inches above the flood level rim of the highest fixture and shall connect with the soil or waste stack through, at, or below the lowest horizontal soil or waste branch, or with the house drain, in such manner as to prevent the accumulation of rust scale. When water closets are installed on this lowest horizontal branch, they shall be connected to the side of the horizontal branch
Every building in which plumbing is installed shall have at least one stack vent or vent stack which shall run undiminished in size and as directly as possible from the building drainage system through to the open air above the roof and in accordance with Section P-1103.4. The minimum size of the stack vent or vent stack shall be 3 inches.
No vent terminal from a sanitary drainage system shall be directly beneath any door, window or other ventilating opening of the same or adjacent building, nor shall any such vent terminal be within 12 feet horizontally of such an opening unless it is at least 3 feet above the top of such opening.
Extensions of vent pipes through a roof shall be terminated at least 2 feet above the roof surface and shall be properly flashed. Where the roof is used for any purpose other than weather protection, the vent pipe shall extend at least 7 feet above the roof surface and shall be properly supported.
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