Passive systems include, but are not limited to, fire walls, fire dampers, fire windows. Any buildings that need reliable fire protection systems shall have both activeand passive systems. However, passive systems are most likely more dependable than active systems because, for example, flow control valve in automatic sprinkler systems can be unintentionally shut off. On the other hand, fire walls, fire door assemblies or even fire partitions are unchangeable things. Once those things were built, they willstay just like that.
Walls are still walls.
Doors are still doors. They would never be changed. In some building we might have to choose which systems we will use instead of the other. There might be some necessity that we have to be concerned with. For instance,the Art Museums which have many invaluable paintings.