Indoor discharge of purged gases must be through an appliance burner that is not located in which area?

The correct answer is that the indoor discharge of purged gases must be through an appliance burner that is not located in the combustion chamber. This is due to safety regulations and design standards that dictate how combustion gases and purged gases must be handled in order to prevent hazards.

The combustion chamber is the area where the actual burning of fuel occurs, and allowing purged gases to discharge into this space could create a dangerous buildup of uncombusted gases or improper combustion conditions. Maintaining a clear distinction between where combustion occurs and where gases may be discharged is crucial for safety.

In contrast, areas such as common areas, utility rooms, and storage areas are typically designed with specific protocols to manage the flow of gases safely, so while they too have their restrictions, the combustion chamber's primary function and its potential risks make it particularly critical for maintaining safe operation.