The causes of fires in public buildings and storage areas, the stages of a fire, and three kinds of fire detectors: ionization, photoelectric, and thermal detectors are described. The relative advantages of sprinkling vs. flooding with halon are mentioned. A dual system of cross-zoning is recommendedin order to prevent unnecessary use of a fire extinguisher. There is a helpful checklist for fire safety within a building. Consultation with an expert before installation and regular maintenance are advised.