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// CODE SNIPPET

Section 911 Common Vent

2018 North Carolina Plumbing Code > 9 Vents > 911 Common Vent
JUMP TO FULL CODE CHAPTER

911.1 Individual Vent as Common Vent

An individual vent is permitted to vent two traps or trapped fixtures as a common vent. The traps or trapped fixtures being common vented shall be located on the same floor level.

911.2 Connection at the Same Level

AMENDMENT
This section has been amended at the state or city level.
Where the fixture drains being common vented connect at the same level, the vent connection shall be at the interconnection of the fixture drains or downstream of the interconnection.

911.3 Connection at Different Levels

AMENDMENT
This section has been amended at the state or city level.
Where the fixture drains connect at different levels, the vent shall connect as a vertical extension of the vertical drain. The vertical drain pipe connecting the two fixture drains shall be considered the vent for the lower fixture drain, and shall be sized in accordance with Table 911.3. The upper fixture shall not be a water closet or clothes washer.

TABLE 911.3 COMMON VENT SIZES

PIPE SIZE
(inches)
MAXIMUM DISCHARGE FROM UPPER
FIXTURE DRAIN (dfu)
11/2 1
2 4
21/2 to 3 6

For SI: 1 inch = 25.4 mm.

Related Code Sections


Section 908 Vents, Common Vent
An individual vent is permitted to vent two traps or trapped fixtures as a common vent. The traps or trapped fixtures being common vented shall ...
2012 North Carolina Plumbing Code > 9 Vents > 908 Common Vent
Section 911 Vents, Common Vent
An individual vent is permitted to vent two traps or trapped fixtures as a common vent. The traps or trapped fixtures being common vented shall ...
2018 North Carolina Plumbing Code > 9 Vents > 911 Common Vent
Section P3107 Vents, Common Vent
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2018 North Carolina Residential Code > 31 Vents > P3107 Common Vent
504.3.15 Chimneys and Vents, Multistory Common Vents
Where used in multistory systems, vertical common vents shall be Type B double wall and shall be installed with a listed vent cap ...
2018 North Carolina Fuel Gas Code > 5 Chimneys and Vents > 504 (IFGS) Sizing of Category I Appliance Venting Systems > 504.3 Application of Multiple Appliance Vent Tables 504.3(1) Through 504.3(7) > 504.3.15 Multistory Common Vents
504.3.15 Chimneys and Vents, Multistory Common Vents
Where used in multistory systems, vertical common vents shall be Type B double wall and shall be installed with a listed vent cap ...
2012 North Carolina Fuel Gas Code > 5 Chimneys and Vents > 504 (IFGS) Sizing of Category I Appliance Venting Systems > 504.3 Application of Multiple Appliance Vent Tables 504.3(1) Through 504.3(7) > 504.3.15 Multistory Common Vents
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