Vents
Venting General Requirements
P3101.2.1 | Venting required at all trapped fixtures | |
P3101.2 | Trap seal protection | |
P3101.3 P3103.4 | Use Limitations   No other purposes allowed-venting only | |
P3101.4 P3103.2 | Freeze protection Frost enclosure | |
P3101.5 | Flood resistance | |
P3102.1 | At least one vent must terminate to the outside | |
P3102.2 | Required outside vent must be dry | |
P3102.3 | Minimum size of main vent | |
P3103.1 | Minimum vent height from roof | |
P3103.5 | Vent terminations around windows, doors and openings | |
Vent Connections and Grade
P3104.1 | Required exterior termination or air admittance valve | |
P3104.2 | Installed to allow moisture to drain back into drain pipe | |
P3104.4 | Vents must terminate 6 in. above highest trap | |
P3107 | Common vent requirements | |
P3105 | Fixture vent requirements | |
P3108.1 | Wet Vent Requirements | |
P3109 | Waste stack vent requirements | |
P3110 | Circuit venting | |
P3111 | Combination waste and vent systems |
Vent Pipe Sizing
P3113.1 | Vent size requirements | |
P3113.2 | Developed length | |
P3113.3 | Branch vents | |
P3113.4 | Sump vents | |
P3113.4.1 | Sewage pumps and sewage ejectors |
Island Sink Venting
P3112.1 | Limitations | |
P3112.2 | Vent connection requirements | |
P3112.3 | Vent installation below the fixture flood level rim | |
Air Admittance Valves
P3114.1 | General requirements | |
P3114.2 | Installation | |
P3114.3 | Only allowed if permitted by AHJ | |
P3114.4 | Allowed locations | |
P3114.5 | Access and source of air required | |
P3114.7 | Can be used, as long as one outside vent exists | |
P3114.8 | Prohibited use |
