Rooms with high ceilings require heat detector spacing to be reduced at elevations within which range?

Rooms with high ceilings require heat detector spacing to be reduced at elevations within which range?

• A. 5 - 15 ft.
• B. 10 - 30 ft.
• C. 0 - 10 ft.
• D. 20 - 40 ft.

Answer: (B)

When heat detectors are used in rooms with tall ceilings, the rising heat tends to stratify near the ceiling and may take longer to reach detectors spaced far apart. To catch a developing fire sooner in that upper zone, you place detectors more densely within the vertical region where heat accumulates above the floor. The guideline is to reduce spacing for elevations roughly between 10 and 30 feet above the floor. Within this band, detectors are close enough to pick up the heat plume quickly, improving response time. If you’re below 10 feet, standard spacing usually suffices, and if you go higher than about 30 feet, you’d typically need additional detectors or a different approach to ensure adequate coverage.

When heat detectors are used in rooms with tall ceilings, the rising heat tends to stratify near the ceiling and may take longer to reach detectors spaced far apart. To catch a developing fire sooner in that upper zone, you place detectors more densely within the vertical region where heat accumulates above the floor. The guideline is to reduce spacing for elevations roughly between 10 and 30 feet above the floor. Within this band, detectors are close enough to pick up the heat plume quickly, improving response time. If you’re below 10 feet, standard spacing usually suffices, and if you go higher than about 30 feet, you’d typically need additional detectors or a different approach to ensure adequate coverage.