What is one use of a firewall?

A firewall is specifically designed to act as a barrier to prevent the spread of fire between different areas within a building. By separating un-sprinklered areas from sprinklered areas, the firewall helps to control the potential for fire to move from one section of the structure to another, particularly in environments where automatic fire suppression systems may not be effective. This is crucial for maintaining safety and minimizing damage in the event of a fire.

In contrast, the other options do not align with the primary function of a firewall. Supporting roof structures does not relate to fire prevention, creating electrical rooms pertains more to electrical code and design rather than fire safety, and partitioning off restrooms is related to space management rather than fire containment. The use of a firewall is distinct in its role of enhancing fire safety and protecting both property and occupants in a facility.