29-4-9   HABITABLE SPACES.
   Every habitable space shall have at least one (1) openable window. The total openable area of the window in every room shall be equal to at least forty-five percent (45%) of the minimum glazed area required in Section 29-4-5.
   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 least eight percent (8%) of the floor area of the interior room or space, but not less than twenty-five (25) square feet (2.33 m2). The ventilation openings to the outdoors shall be based on a total floor area being ventilated. (403.1)