Which of the following documents addresses the requirements for the installers of medical gas systems?

The correct answer addresses the requirements for installers of medical gas systems by highlighting the relevant codes and standards that govern their installation and safety in healthcare settings. NFPA 99, the National Fire Protection Association's standard for Health Care Facilities, specifically outlines the necessary safety protocols and compliance criteria for medical gas systems. It covers various aspects including design, installation, and maintenance standards to ensure safety and reliability in delivering medical gases to patients.

Other options pertain to different aspects of healthcare construction and safety. For example, USP 797 focuses on the compounding of sterile preparations, ensuring the cleanliness and safety of pharmaceuticals, not specifically addressing medical gas installations. ASSE 6050 relates to the qualifications for personnel engaged in medical gas system installation; however, it is more about the qualifications than comprehensive installers' requirements in their entirety. ASHRAE/ASHE 170 deals with ventilation for health care facilities and does not specifically focus on medical gas systems. Therefore, NFPA 99 stands out as the most relevant document in this context regarding the installers of medical gas systems.