Red Seal Gasfitter — Class A Practice Exam

Name one safety feature of modern gas appliances.

1. Flame thrower

2. Thermostatic control

3. Oxygen depletion sensor

4. Cross-contamination filter

The correct answer is: Oxygen depletion sensor

One important safety feature of modern gas appliances is the oxygen depletion sensor. This device plays a critical role in ensuring the safe operation of gas appliances. It continuously monitors the level of oxygen in the environment where the appliance operates. When it detects a drop in oxygen levels, which could indicate potentially dangerous conditions or inadequate ventilation, the sensor automatically shuts off the gas supply to the appliance. This helps prevent hazardous situations, such as carbon monoxide buildup, which can occur in areas where ventilation is insufficient, offering a layer of safety for users. Other options such as a flame thrower and cross-contamination filter do not serve a direct safety purpose in gas appliances, while thermostatic control is more aimed at regulating temperature rather than ensuring safety during operation.