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

The medical air compressor sources should not be located in an outdoor enclosure due to several safety and operational considerations.

Medical air systems are designed to supply clean, breathing-quality air for medical purposes, which entails rigorous standards for air quality and contamination control. When located outdoors, these systems could be exposed to various environmental factors such as humidity, temperature extremes, and particulate matter, which could compromise the integrity of the air being supplied.

Additionally, outdoor environments can pose risks related to the enclosure's security and the potential for exposure to hazardous conditions. Electrical and mechanical components of the medical air compressor could also be adversely affected by weather-related factors, leading to operational failures or safety hazards.

In contrast, oxygen supply systems, nitrous oxide systems, and anesthetic gas scavenging systems have specific guidelines governing their placement and installation that may permit outdoor enclosures under certain conditions, as long as they adhere to applicable codes and regulations that ensure safety and maintain the integrity of the gases being stored and used.