After an explosion on the 5th floor, what action should the FDNY request the FLS Director to implement?

In the event of an explosion, requesting a full evacuation is the most prudent action to ensure the safety of everyone in the building. Explosions can lead to numerous hazards, including potential secondary explosions, structural damage, and the risk of fire. A full evacuation allows all occupants to leave the premises and move to a safe distance, minimizing the risk of injury or further harm.

A full evacuation ensures that emergency responders can operate effectively and safely without having to navigate through crowds of people still inside the building. It also facilitates a comprehensive assessment of the situation by emergency personnel, who can better determine any potential further risks that might still be present, such as gas leaks or unresolved threats related to the incident.

While partial evacuation, lockdowns, or staying in place might be appropriate responses for certain situations, none of these options provide the same level of safety in the face of an explosion. Therefore, full evacuation is the correct response, focusing on protecting lives and allowing emergency services to manage the incident effectively.