Which of the following is NOT a feature of the fire life safety system?

The correct answer highlights that elevator maintenance logs are not typically considered a feature of the fire life safety system. Fire life safety systems are primarily designed to protect building occupants during a fire and include components that facilitate an effective response to such emergencies.

Air ducts play a critical role in fire safety since they are part of the building's ventilation system, which must be designed to minimize the spread of smoke and fire. Annunciator panels are essential for indicating the location of a fire or system status, allowing firefighters and safety personnel to assess the situation rapidly. Firefighter stairway phones are crucial for maintaining communication with emergency services during an evacuation or firefighting operation, ensuring that both firefighters and building occupants can communicate effectively in times of crisis.

In contrast, elevator maintenance logs are important for the general upkeep and safety of the elevator systems but do not directly contribute to life safety in the event of a fire. While maintaining elevators is crucial for overall building safety, these logs do not encompass the fire safety features necessary for protecting inhabitants during a fire emergency.