What is passive fire defense?

• A. Fire Suppression System
• B. Clean Agent Systems
• C. Fire Walls and Doors
• D. Fire Alarms

Answer: (C)

Passive fire defense consists of built-in, non-powered features that confine fire and smoke to its point of origin, helping to protect occupants and maintain means of egress. Fire walls and doors exemplify this approach because they create fire-rated barriers that compartmentalize a building, slowing or stopping the spread of heat, flames, and smoke without relying on detection, activation, or external energy.

The other options are active measures. A fire suppression system uses water or other agents to control or extinguish the fire, which requires activation and energy. Clean agent systems similarly release an extinguishing agent automatically, again dependent on detection and system operation. Fire alarms are notification and warning devices that alert occupants but do not physically impede fire growth.