G2 Gas Fitter Practice Exam

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In a downflow forced air furnace, where does the supply air exit?

At the Top
From the Sides
At the Bottom
Through the Front

The correct answer is: At the Bottom

In a downflow forced air furnace, the supply air exits from the bottom. This type of furnace is designed for installation in a manner that allows the heated air to be distributed downward into the living space. The air is drawn into the furnace from the top, heated by the burners, and then expelled through the bottom. This design is particularly effective for heating spaces where the furnace is located above the areas being heated, such as in certain basement or utility room applications. The bottom discharge ensures that warm air rises into the room, creating a comfortable environment as the heated air circulates. Other configurations, like top or side discharge, are typically associated with upflow or horizontal furnaces, further emphasizing the unique operation and efficiency of the downflow design.