CSLB C-36 Plumbing ContractorRough-in PlumbingMedium
A plumbing contractor is conducting an inspection of an existing DWV system. The contractor notices that a vent terminal is located too close to an operable window. According to the California Plumbing Code (CPC), what is the minimum horizontal distance required between a vent terminal and an operable window, door, or other opening into a building?
- A3 feet
- B10 feet
- C1 foot
- D5 feet
Show answer & explanationAnswer & explanation
Correct answer: B. 10 feet
To prevent foul odors and potentially harmful gases from entering a building, the California Plumbing Code (CPC) requires a minimum horizontal distance of 10 feet between a vent terminal and any operable window, door, or other opening into the building.
Why the other options are wrong
- A. 3 feet is insufficient and would still likely lead to odor issues.
- C. 1 foot is far too close and would allow odors to easily enter the building.
- D. 5 feet is still generally considered too close for proper odor dispersion.
Vent Terminal Clearances
Minimum required distances from vent pipe terminations to building openings, property lines, and other structures to prevent odor and gas re-entry.
- Prevents entry of sewer gases into building.
- Specified by plumbing codes (e.g., CPC).
- Includes distances from windows, doors, and air intakes.
Memory trick: Vent away from Windows: 'Ten' feet is the 'True' minimum.