What is the safest method of evacuating people from a building in case of fire?

Using stairwells is the safest method of evacuating people from a building in case of fire because they are specifically designed for emergency egress. Stairwells provide a straightforward, accessible route that is often less affected by smoke and heat compared to other areas of a building, making them safer for escape.

Elevators are not suitable during a fire because they may malfunction, be directly affected by the fire, or automatically stop at floors where fire is present, potentially trapping occupants inside. Evacuating through windows can be hazardous as it may involve climbing or jumping, which poses additional risks of injury. Gathering in the lobby is not advisable, as this area may become dangerous if smoke or fire spreads there, and it may impede evacuation efforts instead of facilitating them.

Thus, utilizing stairwells for evacuation maximizes safety and efficiency during a fire emergency.