Which of the following is NOT a characteristic of passive fire protection?

• A. Built into the fabric of the building to contain fire
• B. Uses fire-resisting walls and doors
• C. Relies on automatic alarms and sprinkler systems
• D. Includes self-closing fire doors

Answer: (C)

Passive fire protection relies on features built into the structure that stop fire spreading and preserve compartment integrity without needing action, energy, or external systems. The use of automatic alarms and sprinkler systems is not part of this; that describes active fire protection, which relies on detection, water supply, and system activation to suppress fire. The other statements—being built into the fabric to contain fire, using fire-resisting walls and doors, and including self-closing fire doors—are all passive measures that help compartmentalize and resist fire without external input.