Which term defines the distance measured along a slope to the next sprinkler?

Which term defines the distance measured along a slope to the next sprinkler?

• A. Distance measured along slope to next sprinkler.
• B. Height from floor to sprinkler head.
• C. Horizontal distance between sprinklers.
• D. S Dimension.

Answer: (D)

On sloped ceilings, spacing from one sprinkler to the next is described using the S Dimension. This is the official term in NFPA 13R for the distance measured along the slope, which matters because the coverage path follows the incline rather than purely horizontal or vertical directions. Using the S Dimension helps ensure the sprinklers provide the intended coverage and hydraulic performance on pitched surfaces. Height from the floor to the sprinkler head is a vertical measurement, not the slope distance. Horizontal distance between sprinklers is the plan-view spacing, not along the slope. The phrase distance measured along slope describes the concept, but the formal designation used in the standard is the S Dimension.

On sloped ceilings, spacing from one sprinkler to the next is described using the S Dimension. This is the official term in NFPA 13R for the distance measured along the slope, which matters because the coverage path follows the incline rather than purely horizontal or vertical directions. Using the S Dimension helps ensure the sprinklers provide the intended coverage and hydraulic performance on pitched surfaces.

Height from the floor to the sprinkler head is a vertical measurement, not the slope distance. Horizontal distance between sprinklers is the plan-view spacing, not along the slope. The phrase distance measured along slope describes the concept, but the formal designation used in the standard is the S Dimension.