Replace this section and the exceptions with the following:

All habitable rooms shall be provided with natural light by means of exterior glazed openings with an area of not less than five percent of the floor area of such rooms with a minimum area of five square feet, except that minimum egress requirements shall govern. Natural ventilation shall be provided by openings to the exterior of not less than four percent of the floor area of habitable rooms. Such openings shall be openable and readily controllable by the building occupants. In lieu of required exterior openings for natural ventilation, a mechanical ventilating system may be provided. Such system shall be capable of providing air changes in accordance with the 2015 IECC as adopted and amended.