San Francisco County Municipal Code Ch. 9 Vents

SECTION 901.0 – GENERAL 901.1 Add the following second paragraph to this section: No mechanical device shall be installed in any venting system. Such venting system shall remain unobstructed to an approved termination. SECTION 907.0 – VENT STACKS AND RELIEF VENTS 907.1 Revise the first sentence of this section as follows: 907.1 Drainage Stack. Each drainage stack that extends [ ← ] six (6) or more stories shall be served by a parallel vent stack, which shall extend undiminished in size from its upper terminal and connect to the drainage stack at or immediately below the lowest fixture drain. 907.3 Add the following section: 907.3 Vent Stacks and Relief Vents. Every building in which plumbing is installed shall have at least one main stack which shall run undiminished in size and as directly as possible from each building drain serving said building through to the open air above the roof. For the purposes of this section, the main stack shall be defined as the largest size stack that is connected to a building drain or sewer. A vent stack shall be installed with a soil or waste stack whenever relief vents or other branch vents are required in two or more branch intervals. A vent stack shall be installed in accordance with Section 706.1. The size of the soil stack shall be determined by the total fixture units on that stack as per Table 703.2. SECTION 911.0 – CIRCUIT VENTING

911.0 Revise this section as follows: 911.0 Circuit Venting. Circuit venting is not permitted unless it is approved as an alternative engineered design in accordance with Section 301.5 of this Code.