What is the temperature rating range for sprinklers located at the roof of the ceiling?

What is the temperature rating range for sprinklers located at the roof of the ceiling?

• A. 250F to 300F
• B. 135F to 170F
• C. 200F to 250F
• D. 300F to 350F

Answer: (A)

Sprinkler temperature rating is the heat at which a sprinkler is designed to release water. When sprinklers are located at the roof or in exposed ceiling spaces, ambient heat from sunlight and roof materials can raise the surrounding temperature. To prevent nuisance discharge in these hotter conditions while still guaranteeing activation in a real fire, roof-mounted sprinklers use a higher rating. The 250–300 °F range is the standard high rating used for roof/ceiling installations, which is why it’s the best choice. Lower ratings are intended for typical interior temperatures and would be more prone to false activation in a hot roof space.

Sprinkler temperature rating is the heat at which a sprinkler is designed to release water. When sprinklers are located at the roof or in exposed ceiling spaces, ambient heat from sunlight and roof materials can raise the surrounding temperature. To prevent nuisance discharge in these hotter conditions while still guaranteeing activation in a real fire, roof-mounted sprinklers use a higher rating. The 250–300 °F range is the standard high rating used for roof/ceiling installations, which is why it’s the best choice. Lower ratings are intended for typical interior temperatures and would be more prone to false activation in a hot roof space.