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� � • <br /> 37.0.9.1 Smolce detectors. � <br /> 310.9.I.I General.3�we]Jiz►g uni�,ts,•congxegate residences and hotel oz lodgi.ng house guest . <br /> rooms that are used for sleeping purposes shall be provided with smolce de�ectors:Detectors shall be <br /> installed zn accord.ance�vith the approved manufacturer's instructions. <br /> 310.9.1.2 Additions, alterations or repairs to Group R Occupancies. YYhen the valuation of an <br /> add.ition,alteration or repaix to a Group R Occupanry exceeds $1,OQ0 and a permit is requ.ired, or <br /> tivhen oneor moxe sleepi.zig rooms are added�or created in existing Group R Occupancies, smoke <br /> detectorsshall be installed in accordance tivith Sections 3I0.9.I.3, 3I0.9.1.4 and 3I0.9.1.5 of this <br /> section. <br /> �XCEP7TON:�Zepazzs�to the exterior surfaces of a Group R�Occupancy are exempt from the zequire- <br /> ments of this sectiori. <br /> 310.9.1.3 Z'otivez source. 7�n new construction, req,uixed smolce detectors shall receive thei.z pzi- <br /> mary potiver from the building wixing when such w�ring is sezved from a commercial source and <br /> shaII be equipped wi.th a battery bacl<up. T'he detector shall emit a signal when the batteries are lotiv. <br /> �rYiring shall be permanent and`vithout a d.isconnecting stivitch other than those required£or over- <br /> current protection. Smolce detectors may be solely battery operated when installed in existing <br /> buil.dings; or i.n buildi.ngs�vxthou.t comznercial potiver; or in buildings tivhi�ch undergo alteratzons, <br /> .repairs or additions regulated by Section 3I0.9.1..2. <br /> 3I4.9.I.4 Location tivithin dwelling uni,ts. Xn dwelling unzts, a detector shall be installed in each <br /> sleeping xoom and at a point centrally located in the corridoz or area gzvi.ng access to each separate <br /> sleeping azea.Whezi the dwelling unit has more than one story and i.n d�vellings tivith basements, a <br /> detector shall be installed on each story and in the baseznent, xn dtivelling uni�ts tivhere a story or base- <br /> ment is spl.it into two or more levels, the smolce detector shall be installed on the upper level, except <br /> that�vhen the�otiver Ievel coz�tains a sleeping area, a detector sba1T�be Snsta'lled on each level.When <br /> sleeping rooms are on an upper level, the detector shall be placed at the ceiling of the upper Ievel i.n <br /> close proxzmity to the stainvay, xn dwe7Jing unitts tivhere the ceiJing height o£a xoom operi to ihe <br /> halhvay servi.ng the bedrooxns exceeds that of the hallway by 24 inches (6�0 mzn) or more, smoke <br /> detectors shall be xnsta.11ed i.zz the halltivay and in the adjacent room. Detectors shall sound an alanm <br /> audible in all sleeping azeas of the dtivelling unit in tivhich they are located. <br />