Which factors influence sprinkler head spacing and coverage in NFPA 13?

• A. Hazard classification, occupancy type, and required density
• B. Building location, ceiling height, and paint color
• C. Number of exits, occupant load, and sprinkler color
• D. Weather, humidity, and time of day

Answer: (A)

The main idea tested is that sprinkler head spacing and coverage are determined by how hazardous the space is, what the space is used for, and the required water density for that space. NFPA 13 uses hazard classification to set how much water per area is needed and how it should be distributed. The type of occupancy influences the expected hazards and usage patterns, which in turn affects the design requirements. The “required density” is the target amount of water per square foot per minute that must reach the protected area, and this directly drives how closely heads must be spaced to meet that density.

So, hazard classification tells you how aggressive the water distribution must be; occupancy type reflects how occupants interact with the space and what hazards are present; and the required density defines the actual water delivery target, which together determine head spacing and coverage. Other factors like building location, paint color, number of exits, sprinkler color, weather, humidity, or time of day don’t govern the hydraulic design or coverage in NFPA 13.