Under what circumstances is a high-expansion foam system preferred over a traditional sprinkler system?

A high-expansion foam system is preferred over a traditional sprinkler system in specific circumstances where rapid flooding of a large volume is needed, where water damage needs to be minimized, or where access to the fire is difficult. High-expansion foam systems generate a large volume of foam from a relatively small amount of water and foam concentrate. The foam expands to hundreds or even thousands of times its original volume, quickly filling an enclosed space. One situation where high-expansion foam is preferred is in the protection of large storage areas, such as warehouses or record storage facilities. The foam can quickly fill the entire ....