What is a common purpose of sprinkler systems within a building?

Sprinkler systems are designed primarily to extinguish fires automatically or to control their spread within a building. This is achieved by discharging water when the heat from a fire reaches a certain temperature, activating the sprinkler heads. The water deluge not only helps to suppress and extinguish flames but can also minimize smoke and heat production, providing valuable time for occupants to evacuate and for firefighters to respond.

Other options, while relevant to fire safety and building management, do not accurately reflect the fundamental function of sprinkler systems. For instance, signaling firefighters to respond is typically addressed through alarm and notification systems rather than sprinklers. Providing cool air during heat events does not describe any aspect of sprinkler function, as these systems are not designed for temperature control. Similarly, enhancing visibility in smoke is not a role of the sprinkler system; rather, that is typically managed through ventilation strategies and smoke control systems. Thus, the primary and most pertinent role of sprinkler systems indeed lies in their ability to extinguish fires or control their progression.