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The following San Francisco Fire Code definition replaces the corresponding California Fire Code definition in Section 202:
[For SF] STANDPIPE SYSTEM, CLASSES OF. A standpipe system is a wet system of piping, valves, outlets and related equipment designed to provide water at specified pressures and installed exclusively for the fighting of fires, including the following:
Class I is a standpipe system equipped with 3-inch (76.2 mm) outlets.
Class II is a standpipe system directly connected to a water supply and equipped with 1½-inch (38.1 mm) outlets and hose.
Class III is a standpipe system directly connected to a water supply and equipped with 3-inch (76.2 mm) outlets or 3-inch (76.2 mm) and 1½-inch (38.1 mm) outlets when a 1½-inch (38.1 mm) hose is required. Hose connections for Class III systems may be made through 3-inch (76.2 mm) hose valves with easily removable 3-inch by 10-inch 1 (76.2 mm by 38.1 mm) reducers.