G2 Gas Fitter Practice Exam

What is indicated by spillage of flue gases at the appliance draft diverter?

1. Excessive heat

2. A working venting system

3. Restriction in the venting system

4. Proper combustion

The correct answer is: Restriction in the venting system

Spillage of flue gases at the appliance draft diverter is a clear indicator of a restriction in the venting system. When there is adequate venting, flue gases should be expelled efficiently outside the structure. If spillage occurs, it suggests that the gases cannot flow freely, which may be due to blockages, incorrect sizing of the venting system, or other forms of obstruction that prevent the proper exit of combustion products. This condition can lead to dangerous situations, such as an accumulation of carbon monoxide and a risk of backdrafting, where flue gases are drawn back into the living space rather than being vented outside. Therefore, recognizing spillage at the draft diverter is crucial for diagnosing potential venting issues and ensuring the safety and efficiency of gas appliances.