G2 Gas Fitter Practice Exam

What is the significance of a draft hood in a gas appliance?

1. To control heat output

2. To regulate combustion air

3. To ensure proper venting of flue gases

4. To improve fuel combustion

The correct answer is: To ensure proper venting of flue gases

The significance of a draft hood in a gas appliance primarily lies in its role in ensuring proper venting of flue gases. A draft hood serves as a critical component that facilitates the safe and efficient removal of combustion byproducts from the appliance to the atmosphere. When a gas appliance operates, it produces flue gases that can be hazardous if not vented correctly. The draft hood is designed to create a specific pressure balance within the venting system. It allows for the safe exit of these gases while drawing in the necessary combustion air from the surrounding environment. This balancing act helps to maintain optimal function and prevents backdrafting, which can lead to dangerous conditions inside the home. Furthermore, by effectively managing the venting process, the draft hood ensures that there is minimal resistance to the flow of flue gases. This contributes to the overall safety of the appliance, ensuring that the user is not exposed to harmful gases and that the appliance operates efficiently. The other options presented—controlling heat output, regulating combustion air, and improving fuel combustion—are functions that, while important, are not the primary purpose of the draft hood. The draft hood itself does not regulate the amount of air for combustion nor does it directly control the heat output. Instead, it