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ARTICLE 4 LIGHT, VENTILATION AND SPACE REQUIREMENTS SECTION 17-400.0 GENERAL 17-400.1 Scope: The provisions of this article shall govern the minimum conditions and standards for the light, ventilation and space for the occu- pancy of a structure. All light, ventilation and space conditions shall comply with the requirements herein prescribed insofar as they are applicable. 17-400.2 Responsibility: The owner of the structure shall provide and main- tain such light, ventilation and space conditions in compliance with these requirements. A person shall not occupy or use, or let to another for occupancy or use, or permit any person to occupy or use any premises which does not comply with the requirements of this article. 17-400.3 Access to public property: All structures shall provide access to public property. Such access shall be maintained unobstructed. 17-400.4 Open space: An open space when used for the origin of light and ventilation shall remain unobstructed. 17-400.5 Alternative devices: In place of the means for natural light and ventilation herein prescribed, alternative arrangements of windows, louvers, or other methods and devices that will provide the equivalent minimum perform- ance requirements shall be permitted when complying with the building code. SECTION 17-401.0 LIGHT 17-401.1 General: All spaces or rooms shall be provided sufficient light so as not to endanger health or safety. 17-401.2 Habitable spaces: Every habitable space shall have at least one window of approved size facing directly to the outdoors or to a court. The minimum total window area, measured between stops, for every habitable room shall be 8 percent of the floor area of such room, except in kitchens when artificial light is provided in accordance with the provisions of the building code. Whenever walls or other portions of a structure face a window of any room and such obstructions are located less than 3 feet (914 mm) from the window and extend to a level above that of the ceiling of the room, such a window shall not be deemed to face directly to the outdoors nor to a court and shall not be included as contributing to the required minimum total window area for the room. 17-401.3 Common halls and stairways: Every common hall and stairway in every building, other than one and two family dwellings shall be adequately lighted at all times with an illumination of at least a 60 watt standard incandescent light bulb (800 lumens) or equivalent for each 200 square feet (18.60 m2) of floor area, provided that the spacing between light fixtures shall not be greater than 30 feet (9144 mm). Every exterior stairway other than for one and two family dwellings shall be illuminated at all times with a minimum of one foot candle (10.76 lux) at floors, landings and treads. 17-401.4 Other spaces: All other spaces shall be provided with natural or artificial light of sufficient intensity and so distributed as to permit the maintenance of sanitary conditions, and the safe use of the space and the appliances, equipment and fixtures. SECTION 17-402.0 VENTILATION 17-402.1 General: All spaces or rooms shall be provided sufficient natural or mechanical ventilation so as not to endanger health or safety. Where mechanical ventilation is provided in lieu of the natural ventilation, such mechanical ventilating system shall be maintained in operation during the occupancy of any structure or portion thereof. 19