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Chapter 70 <br /> the upper level shall suffice for the adjacent lower level if the lower level is less than <br /> one full story below the upper level;however, if there is an intervening door between <br /> the adjacent levels, a smoke detector shall be installed on each level. (3) Every <br /> structure which(i)contains more than one dwelling unit, or(ii)contains at least one <br /> dwelling unit and is a mixed-use structure, shall contain at least one approved smoke <br /> detector at the uppermost ceiling of each interior stairwell. The detector shall be <br /> installed on the ceiling, at least 6 inches from the wall, or on a wall located 6 to 12 <br /> inches from the ceiling, measure to the top of the detector. <br /> (mm)704.2.2 Interconnection is now 704.6.2 <br /> (nn) 704.2.3 Power Source is now 704.6.3 <br /> (oo) 705 Carbon Monoxide Alarm Detectors. Definitions: (i) "Approved <br /> carbon monoxide alarm" or"alarm"means a carbon monoxide alarm that complies <br /> with all the requirements of the rules and regulations of the Illinois State Fire <br /> Marshal, bears the label of a nationally recognized testing laboratory, and complies <br /> with the most recent standards of the Underwriters Laboratories or the Canadian <br /> Standard Association. (ii)Dwelling Unit. A room or suite of rooms used for human <br /> habitation, and includes a single family residence as well as each living unit of a <br /> multiple family residence and each living unit in a mixed use building. (iii) Section <br /> 1. Carbon Monoxide Detector. (a) Every dwelling unit shall be equipped with at <br /> least one approved carbon monoxide alarm in an operating condition within 15 feet <br /> of every room used for sleeping purposes. The carbon monoxide alarm may be <br /> combined with smoke detecting devices provided that the combined unit complies <br /> with the respective provisions of the administrative code, reference standards, and <br /> departmental rules relating to both smoke detecting devices and carbon monoxide <br /> alarms and provided that the combined unit emits an alarm in a manner that clearly <br /> differentiates the hazard. (b) Every structure that contains more than one dwelling <br /> unit shall contain at lease one approved carbon monoxide alarm in operating <br /> condition within 15 feet of every room used for sleeping purposes. (c) It is the <br /> responsibility of the owner of a structure to supply and install all required alarms. It <br /> is the responsibility of a tenant to test and to provide general maintenance for the <br /> alarms within the tenant's dwelling unit or rooming unit, and to notify the owner or <br /> the authorized agent of the owner in writing of any deficiencies that the tenant cannot <br /> correct. The owner is responsible for providing one tenant per dwelling unit the <br /> written information regarding alarm testing and maintenance. The tenant is <br /> responsible for replacement of any required batteries in the carbon monoxide alarms <br /> in the tenant's dwelling unit, except that the owner shall ensure that the batteries are <br /> in operating condition at the time the tenant takes possession of the dwelling unit. <br /> The tenant shall provide the owner or the authorized agent of the owner with access <br /> to the dwelling unit to correct any deficiencies in the carbon monoxide alarm that <br /> have been reported in writing to the owner or the authorized agent of the owner. (d) <br /> The carbon monoxide alarms required may be either battery powered, plug-in with <br /> battery back-up, or wired into the structure's AC power line with secondary battery <br /> back-up. Exemptions: The following residential units shall not require carbon <br /> monoxide detectors: (1) a residential unit in a building that: (i) does not rely on <br /> combustion of fossil fuel for heat, ventilation, or hot water; (ii) is not connected in <br /> any way to a garage; and (iii) is not sufficiently close to any ventilated source of <br />