What does the term "appurtenances" refer to in a medical gas system?

In the context of a medical gas system, the term "appurtenances" refers to supporting devices or components that are essential for the proper functioning and safety of the system. These can include valves, fittings, regulators, and other accessories that are directly involved in the delivery and management of medical gases. Appurtenances are integral to ensuring that gases are supplied safely and effectively to medical staff and patients. They play a critical role in maintaining the integrity and safety of the gas delivery system, thus making them vital for operation in healthcare settings.

The other options relate to important aspects of medical gas systems but do not directly define appurtenances. Additional safety protocols involve guidelines and procedures that augment the operational safety of the system but are not physical components. Emergency equipment refers to tools or devices provided for immediate response during crises, again not serving as appurtenances. Inspection tools are used to assess the condition and performance of the medical gas systems but do not constitute components of the system itself.