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// CODE SNIPPET

918.3.1 Horizontal Branches

2014 FBC - Plumbing, 5th edition > 9 Vents > 918 Air Admittance Valves > 918.3 Where Permitted > 918.3.1 Horizontal Branches
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Individual and branch-type air admittance valves shall vent only fixtures that are on the same floor level and connect to a horizontal branch drain. Where the horizontal branch is located more than four branch intervals from the top of the stack, the horizontal branch shall be provided with a relief vent that shall connect to a vent stack or stack vent, or extend outdoors to the open air. The relief vent shall connect to the horizontal branch drain between the stack and the most downstream fixture drain connected to the horizontal branch drain. The relief vent shall be sized in accordance with Section 906.2 and installed in accordance with Section 905. The relief vent shall be permitted to serve as the vent for other fixtures.

Related Code Sections


918.3.1 Vents, Horizontal Branches
Individual and branch-type air admittance valves shall vent only fixtures that are on the same floor level and connect to a horizontal branch drain ...
2014 FBC - Plumbing, 5th edition > 9 Vents > 918 Air Admittance Valves > 918.3 Where Permitted > 918.3.1 Horizontal Branches
918.3.1 Vents, Horizontal Branches
Individual and branch-type air admittance valves shall vent only fixtures that are on the same floor level and connect to a horizontal branch drain ...
2017 FBC - Plumbing, 6th edition > 9 Vents > 918 Air Admittance Valves > 918.3 Where Permitted > 918.3.1 Horizontal Branches
918.3.1 Vents, Horizontal Branches
Individual and branch-type air admittance valves shall vent only fixtures that are on the same floor level and connect to a horizontal branch drain ...
2020 FBC - Plumbing, 7th edition > 9 Vents > 918 Air Admittance Valves > 918.3 Where Permitted > 918.3.1 Horizontal Branches
917.4 Vents, Length of Horizontal Branches
The length of horizontal branches shall conform to the requirements of Sections 917.4.1 through 917.4.3 ...
2017 FBC - Plumbing, 6th edition > 9 Vents > 917 Single Stack Vent System > 917.4 Length of Horizontal Branches
917.4 Vents, Length of Horizontal Branches
The length of horizontal branches shall conform to the requirements of Sections 917.4.1 through 917.4.3 ...
2020 FBC - Plumbing, 7th edition > 9 Vents > 917 Single Stack Vent System > 917.4 Length of Horizontal Branches
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