Which temperature range does Extra High Classification cover?

Which temperature range does Extra High Classification cover?

• A. up to 325°F
• B. up to 375°F
• C. up to 450°F
• D. up to 500°F

Answer: (B)

Extra High is a sprinkler temperature-rating category used in NFPA 13R to handle higher-heat environments. It specifies the maximum ambient temperature at which the sprinkler’s heat-responsive element is designed to activate. For Extra High, that maximum is 375°F, which is higher than the lower classifications (which correspond to lower maximum temperatures) but lower than any higher, non-standard options. So this rating is chosen when a space could reach quite high heat, and the sprinkler needs to be able to respond reliably without tripping prematurely at normal indoor temperatures. The other numbers don’t fit this category because they correspond to lower classifications or to ratings not used for Extra High in 13R.

Extra High is a sprinkler temperature-rating category used in NFPA 13R to handle higher-heat environments. It specifies the maximum ambient temperature at which the sprinkler’s heat-responsive element is designed to activate. For Extra High, that maximum is 375°F, which is higher than the lower classifications (which correspond to lower maximum temperatures) but lower than any higher, non-standard options. So this rating is chosen when a space could reach quite high heat, and the sprinkler needs to be able to respond reliably without tripping prematurely at normal indoor temperatures. The other numbers don’t fit this category because they correspond to lower classifications or to ratings not used for Extra High in 13R.