What is the minimum spacing for ceiling detectors?

The correct answer indicates that the minimum spacing for ceiling detectors is based on a height factor referred to as "H." This concept of spacing is critical for ensuring that the detector can effectively sense smoke or heat in a room.

When determining the spacing for ceiling-mounted detectors, the "H" represents the height of the ceiling. The specification of 0.4H means that for every foot that the ceiling is above the floor, the minimum spacing between detectors should be 0.4 times that height. This spacing is established to ensure that the detectors can adequately cover the area and respond promptly to potential hazards.

If the spacing was set too far apart, there might be sections of the room that would not be adequately monitored, leading to delays in detection and increased risk during a fire or similar emergency. This guideline helps ensure a balance between effective coverage and practical installation limits.