If smoke detectors are mounted on a wall, they should be installed between ___ and ___ inches from the ceiling?

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Multiple Choice

If smoke detectors are mounted on a wall, they should be installed between ___ and ___ inches from the ceiling?

Explanation:
Placing a wall-mounted smoke detector within a specific distance from the ceiling is about sensing smoke quickly as it rises. Smoke concentrates near the ceiling, so the detector should be close enough to the ceiling to detect the early smoke plume, but not so close that it sits in the still air right at the top. The recommended range is four to twelve inches below the ceiling. Distances under four inches are too close and can miss circulating smoke, while distances over twelve inches place the detector too far from the ceiling and delay detection. So the best range is four to twelve inches.

Placing a wall-mounted smoke detector within a specific distance from the ceiling is about sensing smoke quickly as it rises. Smoke concentrates near the ceiling, so the detector should be close enough to the ceiling to detect the early smoke plume, but not so close that it sits in the still air right at the top. The recommended range is four to twelve inches below the ceiling. Distances under four inches are too close and can miss circulating smoke, while distances over twelve inches place the detector too far from the ceiling and delay detection. So the best range is four to twelve inches.

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