What is the maximum protection area for standard sprinklers in light hazard, unobstructed construction?

What is the maximum protection area for standard sprinklers in light hazard, unobstructed construction?

• A. 240 sq ft
• B. 225 sq ft
• C. 210 sq ft
• D. 230 sq ft

Answer: (B)

In sprinkler design, each standard sprinkler has a maximum protection area—the largest area that one sprinkler is intended to cover while still meeting the required water density. For light hazard, unobstructed construction, that maximum area is 225 square feet. This value comes from NFPA 13 tables and is used when hydraulically calculating how many sprinklers are needed and how they should be spaced to ensure the entire space receives the necessary fire protection. If there are obstructions or if the hazard level changes, the allowable area per sprinkler changes too, typically becoming smaller, which means more sprinklers or closer spacing are needed. The 225 square feet figure specifically reflects light hazard with no obstructions.

In sprinkler design, each standard sprinkler has a maximum protection area—the largest area that one sprinkler is intended to cover while still meeting the required water density. For light hazard, unobstructed construction, that maximum area is 225 square feet. This value comes from NFPA 13 tables and is used when hydraulically calculating how many sprinklers are needed and how they should be spaced to ensure the entire space receives the necessary fire protection. If there are obstructions or if the hazard level changes, the allowable area per sprinkler changes too, typically becoming smaller, which means more sprinklers or closer spacing are needed. The 225 square feet figure specifically reflects light hazard with no obstructions.