Ultra High Classification applies to temperatures above which threshold?

Ultra High Classification applies to temperatures above which threshold?

• A. Above 575°F (302°C)
• B. Above 600°F (316°C)
• C. Above 650°F (343°C)
• D. Above 550°F (288°C)

Answer: (A)

Ultra High temperature classification is used for environments where ambient heat can be extremely high, beyond what standard high-temperature sprinklers are rated to handle. The defined cutoff is 575°F (302°C). If the space could reach or exceed that level, sprinklers and components rated for ultra-high temperatures are required to ensure reliable operation during a fire. The 575°F boundary reflects the upper limit of conventional high-temperature listings, so above that point only Ultra High devices are appropriate. The other threshold options don’t represent the NFPA 13R boundary for Ultra High classification.

Ultra High temperature classification is used for environments where ambient heat can be extremely high, beyond what standard high-temperature sprinklers are rated to handle. The defined cutoff is 575°F (302°C). If the space could reach or exceed that level, sprinklers and components rated for ultra-high temperatures are required to ensure reliable operation during a fire. The 575°F boundary reflects the upper limit of conventional high-temperature listings, so above that point only Ultra High devices are appropriate. The other threshold options don’t represent the NFPA 13R boundary for Ultra High classification.