Which of the following systems shall not be permitted to be located in an outdoor enclosure?

Medical air sources should not be located in an outdoor enclosure due to several safety and regulatory considerations. Outdoor enclosures can expose medical air sources to fluctuating temperatures, moisture, and environmental contaminants that can adversely affect their performance. Additionally, outdoor settings may lack the necessary controls to ensure a sterile and safe environment, which is critical for medical air used in healthcare settings.

Medical air must meet strict standards to ensure it is suitable for patient use, and environmental factors can lead to contamination or degradation of the gas. Furthermore, in an outdoor environment, there may be challenges in monitoring for leaks and maintaining consistent pressure and flow, which are essential for reliable operation in medical facilities.

In contrast, other systems like bulk cryogenic liquid cylinders, manifolds for gas cylinders, and manifolds for cryogenic liquid containers can be designed or equipped with necessary safety features and environmental controls that allow for outdoor installation, making them more suitable for such settings. This highlights the specific requirements for safety and regulatory compliance in the storage and management of medical gases, emphasizing the critical nature of where medical air sources are installed.