Which fire protection system is NOT necessarily integrated into the building?

The dry standpipe system is not necessarily integrated into the building's plumbing or water supply infrastructure in the same way that the other fire protection systems are. A dry standpipe is typically designed to be used by firefighters to supply water from a hydrant to the structure during a fire. It consists of vertical pipes that are installed in the building, but they remain dry and contain no water until fire service connects to them, unlike wet standpipes or fire sprinkler systems that are permanently filled with water for immediate use.

In contrast, wet standpipes and fire sprinkler systems are generally integrated into the building's water supply, designed to provide immediate water for firefighting efforts. Fire extinguishers, while essential for fire protection, are standalone units that can be placed strategically throughout a building but are not integrated systems like standpipes or sprinklers. Therefore, when considering integration into a building’s fire protection strategy, the dry standpipe stands out as the system that is not necessarily part of a building’s permanent, integrated infrastructure.