Which of the following indicates a compliance requirement for medical gas installations?

The correct answer, NFPA 99, is key because it specifically addresses the requirements for medical gas installations in healthcare facilities. NFPA 99 is the National Fire Protection Association's standard for health care facilities and outlines safety and performance requirements related to the installation of medical gas systems, ensuring both patient safety and system reliability.

This standard provides detailed guidelines on the design, installation, and maintenance of medical gas systems, encompassing various gases such as oxygen, nitrous oxide, and medical air. Compliance with NFPA 99 helps healthcare providers minimize risk and ensure a safe environment for both patients and staff.

While OSHA regulations, ASTM standards, and ANSI codes might relate to safety or quality in broader contexts, they do not specifically target the unique compliance needs for medical gas installations like NFPA 99 does. Therefore, NFPA 99 is the go-to standard for ensuring that medical gas systems meet the necessary safety and operational requirements in healthcare settings.