(A) Natural Light and Ventilation.
(1) All guest rooms, dormitories and habitable rooms within a dwelling unit shall be provided with natural light by means of exterior glazed openings with an area not less than one tenth of the floor area of such rooms with a minimum of 10 square feet. All bathrooms, toilet compartment, laundry rooms and similar rooms shall be provided with natural ventilation by means of openable exterior openings with an area not less than 1/20 of the floor area of such rooms with a minimum of 1½ square feet.
(2) All guest rooms, dormitories and habitable rooms within a dwelling unit shall be provided with natural ventilation by means of openable exterior openings with an area of not less than 1/20 of the floor area of such rooms with a minimum of 5 square feet.
(B) Origin of Light and Ventilation.
(1) Required exterior openings for natural light and ventilation shall open directly onto a street, public alley, a yard or a courtyard located on the same lot as the building.
(2) Exception.
(a) Required windows may open into a roofed porch where the porch:
1. Abuts a street, public alley, a yard, or a courtyard;
2. Has a ceiling height of not less than 7 feet; and
3. Has the longer side at least 65 percent open and unobstructed.
(3) For the purpose of determining light and ventilation requirements, any room may be considered as a portion of an adjoining room when one 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.
(C) Mechanical Ventilation. In lieu of required exterior openings for natural ventilation, a mechanical ventilation system may be provided in all guest rooms, dormitories, habitable rooms and public corridors. In bathrooms, toilet compartments, laundry rooms and similar rooms a mechanical ventilation system connected directly to the outside shall be provided.
('74 Code, § 7-24-5B) (Ord. 34- 1986; Am. Ord. 2018-025