Smoke control system:

Where smoke control is installed in a building it is usual for there to also be sprinkler protection to the building and its contents.  This is necessary because smoke control systems cannot usually cope with the smoke from very large fires and the quantity of smoke has to be restricted.

Sprinkler systems that are designed to protect life as well as property have features that make them more reliable such as by-passes at the main valve to allow the system to remain active whilst the main valve is being worked on and warning systems for alerting staff to any part of the system that might be turned off.