Which detector type uses spacing determined by the average slope height on a sloped ceiling (detectors not located at the peak)?

Which detector type uses spacing determined by the average slope height on a sloped ceiling (detectors not located at the peak)?

• A. Smoke detectors
• B. Carbon monoxide detectors
• C. Heat detectors
• D. Photoelectric detectors

Answer: (C)

Heat detectors are designed so that, on a sloped ceiling where a detector isn’t at the peak, their spacing is based on the average height of the slope. Heat rises and distributes along the ceiling, so using the average slope height ensures each detector covers the area evenly and will respond promptly to a temperature rise anywhere along the slope. Smoke detectors (and others) follow different placement logic tied to air movement and smoke stratification, often near the apex, and don’t use the average slope height for spacing. So the best choice for spacing determined by the average slope height when not at the peak is heat detectors.

Heat detectors are designed so that, on a sloped ceiling where a detector isn’t at the peak, their spacing is based on the average height of the slope. Heat rises and distributes along the ceiling, so using the average slope height ensures each detector covers the area evenly and will respond promptly to a temperature rise anywhere along the slope. Smoke detectors (and others) follow different placement logic tied to air movement and smoke stratification, often near the apex, and don’t use the average slope height for spacing. So the best choice for spacing determined by the average slope height when not at the peak is heat detectors.