Technical Standards and Safety Authority (TSSA) G3 Practice Exam

What does spillage of flue gases at the appliance draft diverter indicate?

1. An updraft condition in the appliance venting system

2. Under firing

3. Normal operation

4. A restriction in the venting system

The correct answer is: A restriction in the venting system

The spillage of flue gases at the appliance draft diverter indicates a restriction in the venting system. When flue gases do not efficiently exit the appliance through the venting system, it can result in their release around the draft diverter, which is designed to safely redirect flue gases. This spillage is a sign that there may be an obstruction or restriction present, such as a blockage in the chimney or flue, which prevents the proper drafting of exhaust gases. Proper venting is critical for ensuring that flue gases are removed from the appliance safely and efficiently to maintain good combustion and indoor air quality. Other conditions such as an updraft, under firing, or normal operation do not typically result in spillage at the draft diverter. An updraft suggests that gases are moving properly upward as expected, while under firing might lead to incomplete combustion rather than a spillage issue. Normal operation would not produce flue gas spillage as the venting system would be functioning effectively.