Fire Alarm And Detection Practice Test

Spacing of detectors on a smooth ceiling shall be 30 feet.

15 feet 60 feet 30 feet 25 feet

Correct Answer:

30 feet

Explanation:

On smooth ceilings, smoke tends to rise and spread evenly without many obstructions, so detectors can cover larger areas without missing early signs. The spacing is set so that no point in the ceiling plane is more than the detector’s effective reach, and 30 feet between detectors achieves reliable coverage in typical spaces with smooth ceilings. That’s why 30 feet is the best choice here. If the ceiling were rough or had obstacles, air patterns become more turbulent and there can be pockets where smoke reaches detectors more slowly, so closer spacing—around 15 feet—would be used to ensure timely detection. Options like 60 feet would leave too large an unmonitored area, and 25 feet isn’t the standard spacing guideline for smooth ceilings.

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