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17-402.2 Habitable spaces: Every habitable space shall have at least one window which can be easily opened or such other device as will adequately ventilate the space. The total openable window area in every space shall be equal to at least 45 percent of the minimum window area size required in Section 17-401.2. 17-402.3 Toilet rooms: Every bathroom and water closet compartment shall comply with the light and ventilation requirements for habitable space as required by Sections 17-401.2 and 17.402.2 except that a window shall not be required in bathrooms or water closet compartments equipped with an approved mechanical ventilation system. Air exhausted by a mechanical ventilation system from any bathroom or water closet compartment within a dwelling unit shall be exhausted to the exterior and shall not be recirculated to any space, including the space from which it is withdrawn; except that recirculation utilizing an approved odor-filtering device shall be permitted from a room which does not contain a bathbtub or shower. Air exhausted by a mechanical ventilation system from all other bathroom or water closet compartments shall be exhausted to the exterior without recirculation to any space or not more than 85 percent of the exhaust air shall be recirculated where the system is provided effective absorption and filtering equipment complying with the mechanical code. 17-402.4 Cooking facilities: Unless approved through the certificate of occupancy, cooking shall not be permitted in any sleeping room or dormitory unit, and a cooking facility or appliance shall not be permitted to be present in a sleeping room or dormitory unit. 17-402.5 Process ventilation: Where any process permits and where injurious, toxic, irritating or noxious fumes, gases, dusts, or mists are generated by said process, a local exhaust ventilation shall be provided to remove the contaminating agent at the source so that it is not allowed to permeate the general atmosphere of the workroom. Air so exhausted shall be exhausted to the exterior and shall not be recirculated to any space, including the space from which it is withdrawn. 17-402.6 Clothes dryer exhaust: Clothes dryer venting systems shall be independant of all other systems and shall be vented in accordance with the manufacturer's recommendations. SECTION 17-403.0 DWELLING UNIT LIMITATIONS 17-403.1 Separation of units: Dwelling units shall be separate and apart from each other. Sleeping rooms shall not be used as the only means of access to other sleeping rooms or habitable spaces. 17-403.1.1 Privacy{ Hotel units, lodging units, and dormitory units shall be designed and maintained to provide privacy. 17-403.2 Cormon access: A habitable space, bathroom, or water closet compartment which is accessory to a dwelling unit shall not open directly into or be used in conjunction with a food store, barber or beauty shop, doctor's or dentist's examination or treatment room, or similar room used for public purposes. 17-403.3 Below grade rooms: Rooms partially or completely below grade shall not be used as habitable space unless: 1. Floor and walls are water-tight so as to prevent the entry of moisture; 2. Total window area, total openable window area and ceiling height are in accordance with this code; 3. Required minimum window area of every habitable space is entirely above the grade adjoining such window areas; and 4. Means of egress and emergency escape are provided in accord- ance with this code. 2O