What is the floor area limit per obstruction?

What is the floor area limit per obstruction?

• A. Must not exceed 12 ft²
• B. Must not exceed 18 ft² (1.7 m²)
• C. Must not exceed 25 ft²
• D. Must not exceed 30 ft²

Answer: (B)

In NFPA 13R design for low‑rise homes, there’s a limit to how large the floor area can be protected around an obstruction. This helps ensure that the sprinkler’s spray pattern can still reach all parts of the space when something in the room blocks part of the coverage, like cabinets, furniture, or a beam. The standard sets that floor area limit at 18 ft² (1.7 m²) per obstruction. If the area around an obstruction would exceed this value, additional sprinklers or different spacing are needed to maintain effective protection. The other numbers don’t align with the NFPA 13R limit for per‑obstruction coverage.

In NFPA 13R design for low‑rise homes, there’s a limit to how large the floor area can be protected around an obstruction. This helps ensure that the sprinkler’s spray pattern can still reach all parts of the space when something in the room blocks part of the coverage, like cabinets, furniture, or a beam. The standard sets that floor area limit at 18 ft² (1.7 m²) per obstruction. If the area around an obstruction would exceed this value, additional sprinklers or different spacing are needed to maintain effective protection. The other numbers don’t align with the NFPA 13R limit for per‑obstruction coverage.