Who typically utilizes Class I standpipe systems?

Class I standpipe systems are specifically designed to provide a means of water supply for fire department use in emergency situations. These systems feature 2.5-inch hose connections that allow trained firefighters to quickly attach their hoses and deliver water to fight fires effectively. This size of the connection is particularly suited for fire service equipment, as it enables high flow rates that are necessary for combating larger fires.

The other options involve various personnel and their respective tools, but they do not align with the primary purpose and specifications of Class I standpipe systems. The focus of Class I is on providing supplemental water supply for professional firefighting teams, ensuring they can respond quickly and effectively to fires in buildings equipped with these systems.