🔍 Key Concepts

• Automatic fire detection systems (smoke, heat, flame, rate-of-rise) and what each type actually detects • How detectors are arranged in zones and what multiple zones in alarm might indicate • Difference between fire intensity/stage of development and fire size or spread

💭 Think About

• Ask yourself: does the sound or type of alarm directly measure size or spread, or does it tell you something about what is being detected (smoke vs. heat vs. rapid temperature rise)? • Think about an early-stage fire: which detector is most likely to trigger first, and what would that tell you about the fire’s development? • Consider whether a single type of alarm alone can guarantee information about how far a fire has spread through the space.

✅ Before You Answer

• Identify what information smoke detectors provide versus heat or rate-of-rise detectors (early warning vs. high heat). • Consider that multiple zones or multiple heads going into alarm may suggest spread or size, not just the alarm type itself. • Eliminate any choice that claims more certainty than alarms can realistically give about exact fire size or exact spread.