What specific document or code must be consulted for fuel gas appliance certification?

The correct choice is to consult listings and labeling, as this documentation is crucial for verifying that fuel gas appliances meet safety and performance standards. Listings and labeling provide essential information about the appliance's compliance with specific codes and standards established by recognized testing laboratories. These documents indicate that the appliance has been tested and approved for its intended use, ensuring that it is safe and reliable for consumers.

Manufacturer specifications, operating manuals, and installation guides provide valuable information about the operation and installation of the appliance, but they do not necessarily confirm compliance with safety standards. While these documents are important for understanding how to use and install the appliance correctly, they do not serve as certification of the appliance's safety and compliance. Therefore, reliance on listings and labeling is critical to ensure that all gas appliances being used are certified and adhere to pertinent safety regulations.