Which type of fire protection system provides 2-1/2" hose connections used by fire departments?

The Class I system is designed specifically to provide fire departments with the necessary support for firefighting operations in commercial buildings. This system is equipped with 2-1/2" hose connections, allowing firefighters to connect their hoses directly to the building's standpipe system. The primary purpose is to supply water to the firefighters, enabling them to combat fires effectively, especially in larger structures where a significant volume of water is required.

Class I systems are intended for use by trained firefighters and typically do not have any hoses or nozzles attached; rather, they provide the means for professional firefighters to use their own equipment to fight fires. This distinguishes them from Class II systems, which are for use by trained personnel within the building (often equipped with 1-1/2" hoses), and Class III systems, which combine both Class I and Class II features, catering to both firefighter and building occupant needs.

Understanding the role of each class of standpipe systems is vital for effective fire prevention and safety strategies in commercial buildings, highlighting why the Class I system is specifically linked to fire department operations.