Medical air receivers must allow for what during service?

The requirement for medical air receivers to allow for filling during service is crucial because these systems need to maintain a consistent supply of medical air for patient care and various medical applications. During servicing, the ability to fill the receiver ensures that even as routine maintenance takes place, the system remains capable of replenishing its supply of medical air without interruption.

Filling the receiver while ensuring proper operation helps maintain the flow and pressure necessary for safe and effective medical treatments. This characteristic underlines the importance of a reliable and uninterrupted air supply in healthcare settings, especially in emergencies where medical air is critical.

In contrast, options related to being online, being pressurized, or being bypassed do not directly address the operational requirements for maintaining the supply and operational readiness of medical air systems. Being online and pressurized may refer to the system's operational state, but they do not specifically ensure the capacity for filling, which is vital during servicing to avoid supply disruptions. Bypassing the system could lead to risks in patient safety as it would compromise the system's integrity or supply chain, further emphasizing the importance of being able to fill the receivers during service properly.