Which standpipe combines features of both Class 1 and Class 2 standpipe systems?

A Class 3 standpipe system effectively integrates the features of both Class 1 and Class 2 standpipe systems. This dual functionality means that it is designed to accommodate both trained firefighting personnel using larger hoses (as in Class 1 systems) and untrained individuals, like building occupants or private citizens, who may use smaller hoses (as found in Class 2 systems) for initial fire response.

Class 1 systems are intended primarily for use by professional firefighters and provide 2.5-inch (65 mm) connections to facilitate greater flow and pressure for fire suppression. In contrast, Class 2 systems are designed for use by the public and often include smaller, 1.5-inch (38 mm) hoses that are more manageable for non-professionals. The Class 3 standpipe combines these provisions, allowing for flexibility and broader accessibility in emergency situations.

By incorporating both hose sizes and connection types, Class 3 standpipe systems enhance fire safety by catering to the needs of various users, ensuring that an effective response can be mounted even when professional firefighters are not available immediately.