What is the primary purpose of standpipe systems in multi-story buildings?

The primary purpose of standpipe systems in multi-story buildings is to provide firefighters with a water supply connection for attack lines. These systems are installed to ensure that adequate water is readily available to combat fires on higher floors where fire engines may not be able to reach with hoses. Standpipes allow firefighters to connect their hoses directly to the building's water supply, eliminating the need to haul water up multiple flights of stairs, which can be both time-consuming and labor-intensive.

Standpipe systems are critical in emergency response situations, as they facilitate a more efficient deployment of firefighting resources. By having a reliable water source at various floor levels, these systems significantly enhance the effectiveness and speed of fire suppression efforts in buildings that exceed a certain height.

While the other options mention important aspects related to building safety and function, they do not pertain to the primary role of standpipe systems in fire response. Heating, building security, and fire detection visibility serve different purposes in the context of fire safety and building management.