The maximum protection area value of 225 sq ft applies to which hazard category?

The maximum protection area value of 225 sq ft applies to which hazard category?

• A. Light hazard
• B. Ordinary hazard
• C. Extra hazard
• D. High hazard

Answer: (A)

In sprinkler design, each sprinkler head has a maximum protection area—the floor area it’s allowed to cover on its own—which depends on the hazard category of the space. The lighter the hazard, the larger the area a single head can cover because the required water density is lower. For light hazard, the codes permit a protection area up to 225 square feet per head. That’s why the maximum protection area value of 225 sq ft corresponds to light hazard. In higher hazard categories, this per-head area must be smaller to ensure more heads or closer spacing are used to meet the denser water requirements.

In sprinkler design, each sprinkler head has a maximum protection area—the floor area it’s allowed to cover on its own—which depends on the hazard category of the space. The lighter the hazard, the larger the area a single head can cover because the required water density is lower. For light hazard, the codes permit a protection area up to 225 square feet per head. That’s why the maximum protection area value of 225 sq ft corresponds to light hazard. In higher hazard categories, this per-head area must be smaller to ensure more heads or closer spacing are used to meet the denser water requirements.