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CFAA Fire Alarm Technician · Question

What is the maximum permitted spacing between two smoke detectors on a smooth, flat ceiling in an open area?

Smoke detectors must be installed so that the horizontal distance from the detector to any point on the ceiling does not exceed 0.7 times the listed spacing (RS

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Question: What is the maximum permitted spacing between two smoke detectors on a smooth, flat ceiling in an open area?

Answer options:

  • 4.5 meters
  • 12 meters ✅ 9 meters
  • 15 meters

Correct answer: 9 meters

Explanation: Smoke detectors must be installed so that the horizontal distance from the detector to any point on the ceiling does not exceed 0.7 times the listed spacing (RS = 0.7 x S). For a standard 9m spacing, 6.3m is the radius. Simple rule: max 9m apart in open areas.

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