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ASTTBC RFPT — Fire Alarm Systems (AL) · Question

For a standard smooth ceiling, what is the maximum allowed distance between two smoke detectors?

For a smoke detector, the coverage is generally taken as a 9m x 9m square (81 m²) or a 4.5m radius for circular coverage on smooth ceilings. High ceilings (abov

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Question: For a standard smooth ceiling, what is the maximum allowed distance between two smoke detectors?

Answer options:

  • 15 meters
  • 12 meters ✅ 9 meters
  • 6 meters

Correct answer: 9 meters

Explanation: For a smoke detector, the coverage is generally taken as a 9m x 9m square (81 m²) or a 4.5m radius for circular coverage on smooth ceilings. High ceilings (above 3m) require reduced spacing.

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