Intermediate classification corresponds to a maximum ceiling temperature of?

Intermediate classification corresponds to a maximum ceiling temperature of?

• A. For temperatures up to 170°F (77°C)
• B. For temperatures up to 200°F (93°C)
• C. For temperatures up to 250°F (121°C)
• D. For temperatures up to 225°F (107°C)

Answer: (D)

In NFPA 13R, ceiling-temperature classifications describe the maximum ceiling temperature that the protected space is expected to reach for sprinkler design purposes. The intermediate classification is defined for ceilings that can reach about 225°F (107°C). This sits above the lowest category (up to 170°F) and below the highest category (up to 250°F), making 225°F the mid-range value used for many residential spaces. So the correct choice reflects this mid-range ceiling temperature, while the other temperatures correspond to other categories or aren’t used for the intermediate designation.