Final answer:
Yes, building security is responsible for closing the doors on the floor of the alarm during a fire emergency to contain the fire and prevent its spread.
Step-by-step explanation:
Yes, it is the duty of building security to isolate a fire emergency by closing the doors on the floor of the alarm. This is done to contain the fire and prevent it from spreading to other areas of the building. By closing the doors, barriers are created that can slow down the movement of smoke and fire, giving people more time to evacuate safely.
For example, in the Triangle Shirtwaist Factory Fire in 1911, the doors were locked, preventing workers from escaping and resulting in the deaths of many. This tragic event led to the realization of the importance of proper fire safety protocols and the implementation of regulations to prevent similar incidents.