Vents

Vents

Section 3101 IRC

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