Imagine the scenario. As the building manager in a large five-storey, urban office building, which is staffed by 650 workers covering multiple shifts, you are responsible for managing fire safety.The building is equipped with multiple fire escape routes and is covered by an automatic sprinkler system, which is linked to the evacuation alarm. Fire alarms are tested every week, and twice a year there is a fire drill during which staff evacuate to a hall area elsewhere in the building rather than an external assembly point.