(A) Every habitable room shall have at least one window or skylight facility directly to the outdoors. The minimum total window area, measured between stops, for every habitable room shall be 8% of the floor area of such room. Whenever walls or other portions of structures face a window of any room and light-obstruction structures are located less than three feet from the window and extend to a level above that of the ceiling of the room, the window shall not be deemed to face directly to the outdoors and shall not be included as contributing to the required minimum total window area. Whenever the only window in a room is a skylight-type window in the top of the room, the total window area of the skylight shall equal at least 15 % of the total floor area of the room.
(B) Emergency egress.
(1) Every sleeping room shall have at least one operable window or exterior door approved for emergency egress or rescue. The units must be operable from the inside to a full clear opening without the use of a key or tool. Where the windows are provided as a means of egress or rescue, they shall have a sill height of not more than 44 inches above the floor. All egress or rescue windows from sleeping rooms must have a net clear opening of 5.7 square feet. The minimum net clear opening height shall be 24 inches. The minimum net clear opening width shall be 20 inches. Grade floor windows may have a minimum net clear opening of 5.0 square feet. Existing windows shall be permitted to utilize removable sash. To achieve required opening, sash shall be capable of being removed without use of key or tool.
(2) Sliding glass doors may be considered to meet the required window area provided the required square foot area is met.
(C) Ventilation.
(1) The glazed areas need not be openable when the opening is not required by division (B)(2) above, and an approved mechanical ventilation system is provided and capable of producing 0.35 air change per hour in the room or a whole-house mechanical ventilation system is installed and capable of supplying outdoor ventilation air of 15 cubic feet per minute per occupant computed on the basis of two occupants for the first bedroom and one occupant for each additional bedroom.
(2) The glazed area may be omitted in rooms where the opening is not required by division (B)(1) above, and an approved mechanical ventilation system is provided and capable of producing 0.35 air change per hour in the room of a whole-housed mechanical ventilation system is installed and capable of supplying outdoor ventilation air of 15 cubic feet per minute per occupant computed on the basis of two occupants for the first bedroom and one occupant for each additional bedroom, and artificial light is provided capable of producing an average illumination of six foot candles over the area of the room at a height of 30 inches above the floor level.
(3) When alcove rooms open without obstruction into adjoining rooms, the required window openings to the outer air shall be based on the combined floor area of room and alcove. For the purposes of determining light and ventilation requirements, any room may be considered as a portion of the adjoining room when at least 1/2 of the area of the common wall is open and unobstructed and provides an opening of not less than 1/10 of the floor area of the interior room but not less than 25 square feet.
(Adopted 9-5-67) (Am. Ord. 491, passed 11-6-03; Am. Ord. 568, passed 1-5-09) Penalty, see § 152.199