Why effective passive fire protection in buildings?

The most important reason is to ensure that in the event of a fire people can escape from the building to avoid being injured or even killed.

Secondly, to help save the building and the assets within it.

Take a hotel or a block of apartments for example. A fire breaks out in one of the rooms, we want that fire to stay contained within that room to allow the people in the building to be evacuated and allow emergency services i.e. the fire brigade to get to the building and put the fire out.

Without effective passive fire containment systems the fire can spread very quickly from room to room and become an inferno.