Red Seal Gasfitter — Class A Practice Exam

What is a potential issue from improper gas venting?

1. Gas leaks

2. Backdrafting, which can lead to carbon monoxide buildup

3. Gas explosions

4. Increased gas consumption

The correct answer is: Backdrafting, which can lead to carbon monoxide buildup

Improper gas venting can lead to backdrafting, which occurs when exhaust gases are not properly expelled from the appliance and instead flow back into the living space. This can create a significant safety hazard, as it allows dangerous gases like carbon monoxide to accumulate indoors. Carbon monoxide is a colorless, odorless gas that can cause serious health issues or even prove fatal if inhaled in sufficient quantities. Proper venting ensures that combustion byproducts are safely removed from the environment, preventing the risk associated with backdrafting. This highlights the importance of adhering to established venting protocols and ensuring that all gas appliances are installed and maintained correctly to mitigate such risks.