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(b) Where Required. One combination standpipe shall be required for every stairway or smokeproof enclosure that ex- tends from the ground floor to the roof in buildings exceeding one hundred and fifty feet (150') in height. (c) Location. Combination standpipe systems shall have connections for dry standpipes located as required in Section 3803(c) and shall have wet standpipe outlets as required in Section 3804(c). Portions of combination standpipe systems, including ex- tensions for wet standpipe outlets, not within an enclosed stairway or smokeproof enclosure shall be protected by a degree of fire resistance equal to that rec/uired for vertical enclosures in the building in which they are located. In buildings where more than one combination standpipe system is provided, they shall be cross connected at the bottom. (d) Detailed Requirements. 1. Construction. Combination standpipe systems shall be installed and tested as required for dry standpipe systems in accordance with Section 3803(d)-1. (2) Size. Combination standpipe systems shall be not less than six inches (6") in diameter. (3) Riser shutoff valve and drain. Each individual riser must be equipped with an OS and Y valve at its base and an approved valve for draining. (4) Fire Department Connections. Ail combination standpipe systems shall be equipped with a four-way fire department connection. Combination standpipe systems with three or more standpipes shall be provided with not less than two four-way fire department inlet connections. All fire department connections shall be located on a street front not less than eighteen inches (18") nor more than four feet (4') above grade and shall be equipped with an approved straightway check valve and substantial plugs or caps. All fire department connections shall be protected against mechanical injury and shall be visible and accessible. The number of fire department connections shall be determined by the Fire Department. (5) Outlets. Every standpipe shall be equipped with a two and one-half-inch (2 1/2") outlet not less than two feet (2') nor more than four feet (4') above the floor level at each story. All standpipes shall be equipped with a three-way two and one- half-inch (2 1/2") outlet above the roof line when the roof has a pitch of less than four inches (4") in twelve inches (12"). Roof outlets are not required for roofs with a pitch greater than four inches (4") in twelve inches (12"). All outlets shall be installed so that a twelve-inch (12") long ~rench may be used in connecting the hose with wrench clearance on all sides of the outlet. Standpipes located in smokeproof enclosures shall have outlets at the vestibule or balcony. Outlets above the fourth floor above grade shall be provided with one hundred feet (100') of two and one-half-inch (2 1/2") approved unlined fabric hose with one-inch (1") orifice, straight-tipped brass nozzle without a shutoff at the nozzle unless waived by the Fire Department. Such outlets shall be identified with a sign having three-inch (3") high letters reading: "FIRE DEPARTMENT USE ONLY." The hose and nozzle shall be installed in an approved hose cabinet. An approved drip cock or drain connection shall be located between the standpipe outlet and the hose. Roof outlets need not be provided with hoses. In areas subject to freezing, wet stand- pipe systems shall be protected from freezing. (6) Signs. An approved durable sign with raised letters at least one inch (1") high shall be permanently attached to all fire department street connections and test connections, and such sign shall read: "COMBINATION STANDPIPE AND TEST CONNECTIONS." -9-