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ATTACHMENT C 1042 2. Responsibility. The owner of the structure shall provide and maintain light, ventilation 1043 and space conditions in compliance with these requirements. A person shall not occupy 1044 as owner-occupant, or permit another person to occupy, any premises that do not comply 1045 with the requirements of this chapter. 1046 3. Alternative devices.In lieu of the means for natural light and ventilation herein 1047 prescribed, artificial light or mechanical ventilation complying with the 1048 International Building Code shall be permitted. 1049 B. Light 1050 1.Habitable spaces.Every habitable space shall have at least one window of approved 1051 size facing directly to the outdoors or to a court. The minimum total glazed area for 1052 every habitable space shall be 8 percent of the floor area of such room. Wherever walls 1053 or other portions of a structure face a window of any room and such obstructions are 1054 located less than 3 feet (914 mm) from the window and extend to a level above that of 1055 the ceiling of the room, such window shall not be deemed to face directly to the 1056 outdoors nor to a court and shall not be included as contributing to the required 1057 minimum total window area for the room. 1058 Exception:Where natural light for rooms or spaces without exterior glazing areas 1059 is provided through an adjoining room, the unobstructed opening to the adjoining 1060 room shall be at least 8 percent of the floor area of the interior room or space, but 1061 not less than 25 square feet (2.33 m2). The exterior glazing area shall be based on 1062 the total floor area being served. 1063 2. Common halls and stairways. Every common hall and stairway in residential 1064 occupancies, other than in one-and two-family dwellings, shall be lighted at all times with 1065 at least a 60 watt standard incandescent light bulb for each 200 square feet (19 m2) of 1066 floor area or equivalent illumination, provided that the spacing between lights shall not be 1067 greater than 30 feet (9144 mm). In other than residential occupancies, means of egress, 1068 including exterior means of egress stairways shall be illuminated at all times the building 1069 space served by the means of egress is occupied with a minimum of 1 footcandle (11 lux) 1070 at floors, landings and treads. 1071 3. Other spaces. All other spaces shall be provided with natural or artificial light sufficient 1072 to permit the maintenance of sanitary conditions, and the safe occupancy of the space and 1073 utilization of the appliances, equipment andfixtures. 1074 C.Ventilation 1075 1. Habitable spaces. Every habitable space shall have at least not less than one openable 1076 window. The total openable area of the window in every room shall be equal to at least 1077 45 percent of the minimum glazed area required in Section 906.06.B.1. 1078 Exception:Where rooms and spaces without openings to the outdoors are 1079 ventilated through an adjoining room, the unobstructed opening to the adjoining 1080 room shall be at least 8 percent of the floor area of the interior room or space, but 1081 not less than 25 square feet (2.33 m2). The ventilation openings to the outdoors 1082 shall be based on a total floor area being ventilated. 1083 2. Bathrooms and toilet rooms. Every bathroom and toilet room shall comply with the 1084 ventilation requirements for habitable spaces as required by Section 906.06.C.1, except 1085 that a window shall not be required in such spaces equipped with a mechanical 1086 ventilation system. Air exhausted by a mechanical ventilation system from a bathroom 1087 or toilet room shall discharge to the outdoors and shall not be recirculated. 24