During smoke testing, smoke will come from which locations if proper connections exist?

• A. Roof vents
• B. Building foundations
• C. Manhole covers
• D. Lateral joints

Answer: (A)

During smoke testing, smoke is pushed into the sanitary sewer and will escape wherever there is a direct path to the atmosphere. Roof vents are the designed outlets for sewer gases, so if the system is properly connected and vented, the smoke should exit through those roof vent outlets. This shows the vent system is functioning and no leaks are allowing smoke to escape elsewhere.

If smoke were observed coming from building foundations, manhole covers, or lateral joints, that would indicate leaks or improper connections to the surrounding environment rather than a normal, correctly vented system.