What is full evacuation?

Full evacuation If the fire alarm goes off or the Emergency Action Team or local authorities assess the situation as extremely dangerous, fire personnel will evacuate the entire building. A full evacuation can be communicated via the PA system (Public Address System) or text alert in addition to the fire alarm.

https://studyplex.org/blog/3-categories-of-evacuation/#:~:text=Get%20Access%20Now-,Full%20evacuation,addition%20to%20the%20fire%20alarm.