Which type of system is typically used to alert about an active fire?

The choice of alarm systems associated with fire sprinklers is important because these systems provide an integrated approach to both firefighting and alerting occupants to danger. When a fire occurs, the heat activates the sprinkler heads, and this action can simultaneously trigger alarm systems. These systems typically include audible alarms and visual indicators that help ensure that building occupants are promptly notified of the fire, allowing for a swift evacuation and response.

In contrast, the other options do not serve the primary function of alerting occupants to an active fire. Manual water mist systems, while effective for fire suppression, rely on manual operation and do not inherently provide an alert mechanism. Smoke generators are used in training and testing environments to simulate smoke but do not serve as fire detection or alert systems during an actual fire. Heating system alarms are designed to alert for faults or issues within the heating system itself, not specifically for fire detection or notification. Therefore, the alarm systems associated with fire sprinklers are uniquely positioned to fulfill the crucial role of alerting building occupants in the event of a fire.