Which term describes a sprinkler with RTI of 50 m^1/2 or less?

Which term describes a sprinkler with RTI of 50 m^1/2 or less?

• A. Compartment
• B. Dwelling Unit
• C. Quick-Response (QR) Sprinkler
• D. Grade Plane

Answer: (C)

RTI, or Response Time Index, measures how quickly a sprinkler responds to heat. A lower RTI means the sprinkler activates faster. In NFPA 13R, sprinklers with an RTI of 50 m^1/2 or less are classified as Quick-Response (QR) sprinklers. This faster response helps control a fire sooner, which is especially important in residential settings. The other terms don’t describe sprinkler response time. A compartment is a design division within a building, not a type of sprinkler. A dwelling unit is a living-space classification, and a grade plane relates to the reference level for mounting near grade, not to how quickly a sprinkler responds. So, the term describing a sprinkler with RTI of 50 m^1/2 or less is Quick-Response (QR) Sprinkler.

RTI, or Response Time Index, measures how quickly a sprinkler responds to heat. A lower RTI means the sprinkler activates faster. In NFPA 13R, sprinklers with an RTI of 50 m^1/2 or less are classified as Quick-Response (QR) sprinklers. This faster response helps control a fire sooner, which is especially important in residential settings.

The other terms don’t describe sprinkler response time. A compartment is a design division within a building, not a type of sprinkler. A dwelling unit is a living-space classification, and a grade plane relates to the reference level for mounting near grade, not to how quickly a sprinkler responds.

So, the term describing a sprinkler with RTI of 50 m^1/2 or less is Quick-Response (QR) Sprinkler.