Final answer:
A facility must comply with NFPA 101, the Life Safety Code, to ensure occupants' protection from fire, smoke, and similar hazards. This code applies to both new and existing buildings.
Step-by-step explanation:
A facility must comply with NFPA 101, the National Fire Protection Association's Life Safety Code. NFPA 101 is a widely accepted standard that provides guidelines for the construction, protection, and occupancy features necessary to minimize dangers to life from fire, smoke, panic, and similar hazards. This code is pivotal in ensuring the safety and welfare of building occupants and applies to new and existing buildings. Other codes mentioned, such as NFPA 5000 (Building Construction and Safety Code), NFPA 1500 (Standard on Fire Department Occupational Safety, Health, and Wellness Program), and NFPA 170 (Standard for Fire Safety and Emergency Symbols), serve different purposes within the NFPA code set.