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surfaces of existing ceilings and partitions within the <br />concealed spaces are of approved fire resistive construction, <br />free of holes and openings. <br /> <br /> (SECTION 929.0 PLENUMS) <br />929.2.1 Pipe: Pipe shall be noncombustible except that plastic <br />fire sprinkler piping in wet pipe systems shall be permitted where <br />the piping has a peak optical density not greater than 0.50, an <br />average optical density not greater than 0.15 and a flame spread <br />not greater than 5.0 feet when tested in accordance with UL 1887 <br />listed in Appendix A. Piping shall bear the label of an approved <br />agency· <br /> <br />929.2.2 Ceiling, Thermal and Acoustical Material: Thermal and <br />acoustical materials and pipe insulation shall have a flame spread <br />of 25 or less and a smoke developed rating of 50 or less when <br />tested in accordance with ASTM E84 listed in Appendix A. <br /> <br /> (Article 10 Fire Protection Systems) <br /> (SECTION 1002.0 FIRE SUPPRESSION SYSTEMS) <br />1002.9 Use Group R-2: An automatic fire suppression system shall <br />be provided throughout all buildings and structures,or portions <br />thereof, of Use Group R-2 in accordance with Section 1004.2.1 or <br />1004.2.2. <br /> <br />Exception: Buildings containing a maximum of two stories with <br />no mezzanines or habitable penthouses; and containing a <br />maximum of 12 dwelling units per building, each having at <br />least one door opening directly to an exterior exit access <br />which leads directly to the exits required to serve that <br />dwelling unit. <br /> <br /> (SECTION 1021.0 FIRE EXTINGUISHERS) <br />1021.2 Where required: A portable fire extinguisher shall be <br />installed in the following locations in accordance with NFiPA 10 <br />listed in Appendix A: <br /> <br />In all buildings of Use Group A-l, A-2, A-3, A-4, B, E, F. H. <br />M. I-1, I-2, R-l, or S. <br /> <br />In all areas containing commercial kitchen exhaust hood <br />systems. <br /> <br />3. In all areas where fuel is dispensed. <br /> <br />In all areas where a flammable or combustible liquid is used <br />in the operation of spraying, coating, or dipping; <br /> <br />In all areas of Use Group I-3 at staff locations. Access to <br />portable extinguishers shall be permitted to be locked; <br /> <br />On each completed floor of buildings under construction, other <br />than buildings of Use Group R-3; <br /> <br />13 <br /> <br /> <br />