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CHAPTER 4 LIGHT, VENTILATION AND OCCUPANCY LIMITATIONS SECTION 401 SECTION 403 GENERAL VENTILATION 401.1 Scope.The provisions of this chapter shall govern the 403.1 Habitable spaces.Every habitable space shall have at minimum conditions and standards for light, ventilation and least one openable window.The total openable area of the win- space for occupying a structure. dow in every room shall be equal to at least 45 percent of the 401.2 Responsibility.The owner of the structure shall provide minimum area in Section 402.1. and maintain light,ventilation and space conditions in compli- Exception:Where rooms and spaces without openings to ance with these requirements. A person shall not occupy as the outdoors are ventilated through an adjoining room,the owner-occupant,or permit another person to occupy,any pre- unobstructed opening to the adjoining room shall be at least wises that do not comply with the requirements of this chapter. 8 percent of the floor area of the interior room or space,but 401.3 Alternative devices. In lieu of the means for natural not less than 25 square feet(2.33 mz).The ventilation open- light and ventilation herein prescribed, artificial light or ings to the outdoors shall be based on a total floor area being mechanical ventilation complying with the International ventilated. Building Code shall be permitted. 403.2 Bathrooms and toilet rooms.Every bathroom and toi- let room shall comply with the ventilation requirements for habitable spaces as required by Section 403.1, except that a SECTION 402 window shall not be required in such spaces equipped with a LIGHT mechanical ventilation system.Air exhausted by a mechanical 402.1 Habitable spaces.Every habitable space shall have at ventilation system from a bathroom or toilet room shall dis- least one window of approved size facing directly to the out- charge to the outdoors and shall not be recirculated. doors or to a court.The minimum total glazed area for every 403.3 Cooking facilities.Unless approved through the certifi- habitable space shall be 8 percent of the floor area of such cate of occupancy,cooking shall not be permitted in any room- room. Wherever walls or other portions of a structure face a ing unit or dormitory unit,and a cooking facility or appliance window of any room and such obstructions are located less shall not be permitted to be present in the rooming unit or dor- than 3 feet(914 mm)from the window and extend to a level mitory unit. above that of the ceiling of the room,such window shall not be deemed to face directly to the outdoors nor to a court and shall Exceptions: not be included as contributing to the required minimum total 1. Where specifically approved in writing by the code window area for the room. official. Exception:Where natural light for rooms or spaces without 2. Devices such as coffee pots and microwave ovens exterior glazing areas is provided through an adjoining shall not be considered cooking appliances. room,the unobstructed opening to the adjoining room shall be at least 8 percent of the floor area of the interior room or 403.4 Process ventilation.Where injurious,toxic,irritating or space,but not less than 25 square feet(2.33 m2).The exte- noxious fumes, gases, dusts or mists are generated, a local rior glazing area shall be based on the total floor area being exhaust ventilation system shall be provided to remove the con- served. taminating agent at the source. Air shall be exhausted to the 402.2 Common halls and stairways.Every common hall and exterior and not be recirculated to any space. stairway in residential occupancies,other than in one-and two- 403.5 Clothes dryer exhaust.Clothes dryer exhaust systems family dwellings,shall be lighted at all times with at least a 60- shall be independent of all other systems and shall be exhausted watt standard incandescent light bulb for each 200 square feet in accordance with the manufacturer's instructions. (19 mz)of floor area or equivalent illumination,provided that the spacing between lights shall not be greater than 30 feet (9144 mm). In other than residential occupancies, means of SECTION 404 egress,including exterior means of egress, stairways shall be OCCUPANCY LIMITATIONS illuminated at all times the building space served by the means -of egress is occupied with a minimum of 1 footcandle(11 lux) 404.1 Privacy.Dwelling units,hotel units,housekeeping units, at floors,landings and treads. rooming units and dormitory units shall be arranged to provide 402.3 Other spaces.All other spaces shall be provided with privacy and be separate from other adjoining spaces. natural or artificial light sufficient to permit the maintenance of 404.2 Minimum room widths.A habitable room,other than a sanitary conditions, and the safe occupancy of the space and kitchen, shall not be less than 7 feet(2134 mm) in any plan utilization of the appliances,equipment and fixtures. dimension.Kitchens shall have a clear passageway of not less 2006 INTERNATIONAL PROPERTY MAINTENANCE CODE® 13