Which class of standpipe is designated for use by both fire departments and occupants?

Class III standpipes are designed to serve both fire department personnel and building occupants. This type of standpipe system is equipped with two different hose connections: one for trained firefighters, typically a larger 2½-inch connection, and a smaller 1½-inch connection intended for use by building occupants who may have less training. This dual-use feature allows for flexibility during firefighting operations, enabling both trained professionals and untrained occupants to utilize the standpipe system effectively in emergency situations. The presence of these connections ensures that both groups can respond to fire emergencies using the standpipe system, providing essential water supply during firefighting efforts.

In contrast, Class I standpipes are exclusively for fire department use, featuring only the 2½-inch outlet, which is meant for firefighters. Class II standpipes are intended for use by building occupants and provide 1½-inch hose connections, but they do not serve the needs of firefighters directly. Class IV does not typically exist in standard classifications for standpipes, making Class III the distinct choice for dual occupancy.