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CHQPTER4 LIGHT, VENTtLATION AND OCCUPANCY LINtITATiONS SECTION 401 GENERAL 401.1 Scope. The provisions of this chapter shall govern the minimum conditions and standards for light, ventilation and space for occupying a structure. 401.2 Respansibility. The owner af the structure shall provide and maintain light, ventilation and space conditions in compli- ance with these requirements. A person shall not occupy as owner-occupant, or permit another person to occupy, any pre- mises that do not comply with the requirements of tlus chapter. 401.3 Atternative devices. In lieu of the means for natural light and ventilation herein prescribed, artiticial light or me- char,ical ver.ti!ation comp(ying with the Iliternational Bui[ding Code shall be permitted. SECTION 402 LlGHT 402.1 Habitab4e :;paces, Every habitable space shall have at least one win:.'s,> of appraved size facing directly to the out- doors or to a courc. The minimum total glazed area for every habitable space shall be 8 percent of the tloor area of such mom. Wherever walls or other poriions of a structure face a window of any room and such obstructions are located less than 3 feet (914 rrun) from the window and extend to a level above that of the ceiling of the room, such window shall not be deemed to face direcdy ro the outdoors nor to a court and shall not be induded as con[ributing to the required minimum total window area for the room. Exception: Where natural light for rooms or spaces without exterior glazing areas is provided through an adjoining room, the unobstructed opening to the adjoining room shall be at least 8 percent of the floor azea of the interior room or space, but not less tban 25 square feet (233 m'-). The exterior glazing area shall be based on the total floor area being served. 402.2 Common halls and stairways. Every common hall and stairway in resideneial occupancies, other than in one- and two- family dwellings, shall be lighted at all times with at least a 60- watt standard incandescen± light bulb tor each 200 square feet (19 m2) of floor area or equivalent illumination, provided that the spacing between lights shall no[ be greater than 30 feet {9144 mm). In other than residential occupancies, means of egress, including exterior means of egress stairways shall be il- luminated a[ all times the buildina space served by the means of egress is occupied with a minimum of 1 footcandle {11 lux) at t7oors, landings and treads. 402.3 Other spaces. All other spaces shall be provided with natural or artificial light sufficient to permit the maintenance of 20Q3 INTERNATIONAL PROPERTY MAINTENANCE CODEO sanitary conditions, and the safe occupancy of the space and utilization of the appliances, equipment and iixtures. SECTION 403 VENTILATION 403.1 Habitable spaces. Every habitable space shall have at least one openabie window. The total openable area of the win- dow in every room shall be equai to at least 45 percent of the minimum glazed area required in Section 402.1. Exception: Where rooms and spaces without openings to the outdoors are ventilated through an adjoining room, the unobstructed opening to the adjoining room shall be at ]east 8 percent of the floor area of the interior room or space, but not less tnan 25 syuare feet �233 m�)• The ventilation ooen- ings to the outdoots shall be based on a total floor area being ventilated. 403.2 Bathrooms and toilet rooms. Every bathroom and toiiet room shall comply with the ventilation requirements for habit- able spaces as required by Section 403.1, except tizat a window shall not be reguired in such spaces equipg.,�� witn a mecnani- cal ventilation system. Air exhausted by a mechanical ventila- tion system from a bathroom or toilet room shall discharge to the outdoors and shall not be recirculated. 403.3 Cooking facilities. Unless approved through the certifi- cate of occupancy, cooking shall not be permitted in any room- ing unit or dormitory unit, and a cooking facility or appliance shall not be permitted to be present in a rooming uiut or dormi- tory unit. Exception: Where specifically approved in writing by the code official. 403.4 Process ventilation. Where injurious, to�cic, uritating or noxious fumes, gases, dusts or �nists are generated, a local ex- haust ventilation system shall be provided to remove the con- taminating agent at the source. Air shall be exhausted to the exterior and not be recirculated to any space. 403.5 Clothes dryer exhaust. Clothes dryer exhaust systems shall be independent of all other systems and shall be exhauseed in accordance with the manufacturer's instructions. SECTION 404 OCCUPANCY LIMITATIONS 404.1 Privacy. llwelling units, hotel units, housekeeping units, rooming units and dormitory units shall be arranged to provide piivacy and be separate from other adjoining spaces. 404.2 Minimum room widths. A habitable room, other than a kitchen, shall not be less than 7 feet (2134 mm) in any pian di- mension. Kitchens shall have a clear passageway of not less 13 � :.'.