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§ 5A-2-1 H AWAI‘I C OUNTY C ODE Exceptions: (1) Glass jalousie blade windows and fixed glass may be used for emergency escape or rescue. (2) Escape or rescue windows in Group R, Division 1 Occupancies opening into an exterior exit balcony serving more than two dwelling units or hotel guest rooms shall have a finished sill height not more than 68 inches above the floor. 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: (1) 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 SUPP. 9 (1-2021) 5A-10