What is a common feature of sprinkler systems?

Sprinkler systems are designed to provide automatic fire suppression, and a key feature is that they activate based on temperature. When a fire occurs, the heat from the flames raises the temperature in the vicinity. Each sprinkler head contains a heat-sensitive element that responds to the rise in temperature, causing it to activate and release water to extinguish the fire or control its spread.

This automatic response is fundamental to the effectiveness of sprinkler systems, as it provides immediate action without the need for human intervention. The activation temperature typically ranges from approximately 135°F (57°C) to 165°F (74°C), depending on the type of sprinkler system and its design requirements.

Other options such as operating only in high-rise buildings or being limited to specific classes of fires misrepresent the versatility and applicability of sprinkler systems, which can be employed in various building types and for different fire classes. Additionally, requiring manual activation contradicts the automatic nature that makes sprinklers vital in fire protection systems.