What must plumbing installations promote in a school or salon?

Plumbing installations in a school or salon must ensure an adequate water supply and effective sewage disposal. This is vital for maintaining health and safety standards, especially in environments where personal grooming and hygiene are performed. An adequate water supply is necessary for various tasks like shampooing hair and washing tools, which are fundamental in cosmetology practices. Furthermore, proper sewage disposal is essential to prevent health hazards and maintain a clean environment, as it helps remove waste effectively and protects public health.

The other options do not encompass the essential requirements for plumbing in these settings. For instance, focusing solely on hot water delivery overlooks the need for cold water access and ignores sewage disposal, which is critical for overall sanitation. Similarly, prioritizing decorative aesthetics does not address practical needs and safety concerns that come with plumbing installations. Limited access to areas does not directly relate to plumbing requirements and may even hinder the functionality and safety of the school or salon.