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All habitable rooms (i.e. rooms for living, sleeping, eating or cooking) shall be provided with natural light by means of exterior glazed openings with an area not less than 1/10 of the floor area of such rooms with a minimum of 10 square feet.
Habitable bedrooms must have at least 2 exits, at least one of which must be a door. The second exit can be a window that also must be a minimum dimension. The current IRC sets the minimum opening area at 5'7 with a minimum opening height of 24 inches and width of 20 inches.