Home›Knowledge›IPC Chapter 9 — Vents
📋 Codecodesplumbing

IPC Chapter 9 — Vents

Updated Mar 26, 2026
Vent sizing, developed length limits, vent types (individual, wet, circuit, stack), AAVs, roof termination.

IPC Ch9: every trap needs vent within developed length (1.5in trap=6ft, 2in=8ft, 3in=12ft). Vent size min half drain size. Roof termination: 6in above, 10ft from windows. Wet vent: 2in min for one fixture group. AAV per ASSE 1051 where permitted. Island venting for kitchen islands.

TAGS
IPCventingtrapAAVwet-ventplumbing
DETAILS
code year
2024
code system
IPC
code section
Chapter 9
RELATED KNOWLEDGE
📋 Code
IBC 903.2.1 — Group A Occupancies (Sprinkler Requirements)
Automatic sprinkler system required throughout buildings with Group A occupancy where fire area exceeds 5,000 square feet, or overall building area exceeds 12,000 square feet, or occupant load of the fire area exceeds 300.
📋 Code
IBC 903.2.7 — Group M Occupancies (Retail Sprinkler Requirements)
Automatic sprinkler system required in Group M (mercantile) occupancies where fire area exceeds 12,000 square feet or building is more than three stories above grade.
📋 Code
IBC 903.2.11.3 — Buildings 55 Feet or More in Height
Automatic sprinkler system required throughout buildings with a floor level having an occupant load of 30 or more that is located 55 feet or more above the lowest level of fire department vehicle access.
📋 Code
IBC 1015.1 — Exit and Exit Access Doorways Required
Two exits or exit access doorways required from any space where occupant load exceeds the table values. Spaces with occupant load exceeding 500 require a minimum of 3 exits. Spaces exceeding 1,000 require 4 exits.
📋 Code
IBC 1017.2 — Exit Access Travel Distance
Maximum travel distance from any point in a building to an exit shall not exceed 200 feet unsprinklered or 250 feet sprinklered for most occupancies. Specific occupancies have modified limits.
📋 Code
IBC Table 601 — Fire-Resistance Rating Requirements
Specifies minimum fire-resistance ratings for structural elements based on construction type (Type I through V). Type IA requires 3-hour rated structural frame, 2-hour floors, and 1.5-hour roof.
← Back to Knowledge Garden