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310.3.5 Light, Ventilation and Sanitation. (a) General. For the purpose of determining the light or ventilation required by this section, any room may be considered as a portion of an adjoining room when half of the area of the common wall is open and unobstructed and provides an opening of not less than one tenth of the floor area of the interior room or 25 square feet, whichever is greater. Exterior openings for natural light or ventilation required by this section shall open directly onto a public way or a yard or court located on the same lot as the building. Exceptions: (I) Required windows may open into a roofed porch where the porch: (A) Abuts a public way, yard or court; and (B) Has a ceiling height of not less than 7 feet; and (C) Has a longer side at least 65 percent open and unobstructed. (2) Skylights. (b) Light. Guest rooms and habitable rooms within a dwelling unit or congregate residence shall be provided with natural light by means of exterior glazed opening with an area not less than one tenth of the floor area of such rooms with a minimum of 5 square feet. (c) Ventilation. Guest rooms and habitable rooms within a dwelling unit or congregate residence shall be provided with natural ventilation by means of an openable exterior opening with an area of not less than one twentieth of the floor area of such rooms with a minimum of 5 square feet. In lieu of required exterior opening for natural ventilation, a mechanical ventilating system may be provided. Such system shall be capable of providing two air changes per hour in all guest rooms, dormitories, habitable rooms and in public corridors. One fifth of the air supply shall be taken from the outside. Bathrooms, water closet compartments, laundry rooms and similar rooms shall be provided with natural ventilation by means of openable exterior openings with an area not less than one twentieth of the floor area of such rooms with a minimum of 11/2 square feet. In lieu of required exterior openings for natural ventilation in bathrooms containing a bathtub or shower or combination thereof, laundry rooms and similar rooms, a mechanical ventilation system connected directly to the outside capable of providing five air changes per hour shall be provided. The point of discharge of exhaust air shall be at least 3 feet from any opening into the building. Bathrooms which contain only a water closet or lavatory or combination thereof, and similar rooms may be ventilated with an approved mechanical recirculating fan or similar device designed to remove odors from the air. (d) Sanitation. Every building shall be provided with at least one water closet. Hotels or subdivisions thereof where both sexes are accommodated shall contain at least two separate toilet facilities which are conspicuously identified for male or female use, each of which contains at least one water closet. The water closet 26