High classification corresponds to a maximum ceiling temperature of?

High classification corresponds to a maximum ceiling temperature of?

• A. For temperatures up to 170°F (77°C)
• B. For temperatures up to 300°F (149°C)
• C. For temperatures up to 225°F (107°C)
• D. For temperatures up to 320°F (160°C)

Answer: (B)

In NFPA 13R design, ceiling-temperature classification tells you the thermal environment the ceiling area can reach and still be compatible with the sprinkler system’s performance. For the high classification, the ceiling can experience higher temperatures, so the standard assigns a maximum ceiling temperature of 300°F (149°C). That’s why this option is the best choice. The other temperatures correspond to different classifications or are not the upper limit for the high class.

In NFPA 13R design, ceiling-temperature classification tells you the thermal environment the ceiling area can reach and still be compatible with the sprinkler system’s performance. For the high classification, the ceiling can experience higher temperatures, so the standard assigns a maximum ceiling temperature of 300°F (149°C). That’s why this option is the best choice. The other temperatures correspond to different classifications or are not the upper limit for the high class.