G2 Gas Fitter Practice Exam

A fan-assisted burner utilizes a mechanical fan to supply combustion air at sufficient pressure to ensure that it can overcome the resistance of the burner itself. This forced air mechanism allows for improved combustion efficiency, leading to better fuel utilization and higher performance in various heating applications.

Natural draft burners rely on the natural buoyancy of heated gases to draw in air, which may not be adequate in systems that require higher pressures. Atmospheric burners depend on the principle of atmospheric pressure to allow combustion air to enter, which might also not meet the pressure requirements needed for certain applications. Power burners, while they can also achieve higher pressure, are specifically designed to provide a more forceful and controlled airflow compared to other types.

In summary, fan-assisted burners are specifically designed to ensure that combustion air is delivered with enough pressure to facilitate effective and efficient burning, which is why this type of burner is the correct choice.