Which statement about fire protection systems correctly differentiates passive and active systems?

• A. Passive systems are built into the structure and require activation during a fire.
• B. Active systems are installed in the building envelope and do not require action to operate.
• C. Passive systems rely on external power to function.
• D. Active systems require activation during a fire to provide protection.

Answer: (D)

Understanding the difference between passive and active fire protection systems comes down to whether a system works without any action or power, or whether it needs a trigger to operate. Passive systems are built into the structure and function without energy input or human action—they’re designed into walls, doors, and compartments to resist fire and limit spread. Active systems rely on a power source or a triggering mechanism to engage and provide protection, such as sprinklers or alarms that activate during a fire. The statement that active systems require activation during a fire to provide protection captures this distinction: activation is what starts their protective action, whereas passive systems do their job by design without needing to be activated.