R310.1 EMERGENCY ESCAPE OPENINGS
R310.1 Emergency escape required. Every sleeping room shall have at least one openable emergency escape window or exterior door opening for emergency escape. Where openings are provided as a means of escape, they shall have a sill height of not more than 44 inches above the floor. Where a door opening having a threshold below the adjacent ground elevation serves as an emergency escape opening and is provided with a bulkhead enclosure, the bulkhead enclosure shall comply with SECTION R310.3. The net clear opening dimensions required by this SECTION shall be obtained by the normal operation of the window or door opening from the inside. Escape window openings with a finished sill height below the adjacent ground elevation shall be provided with a window well in accordance with SECTION R 310.2.
R310.1.1 Minimum opening area. All emergency escape openings shall have a minimum net clear opening of 5.7 square feet. Exception: Grade floor openings shall have a minimum net clear opening of 5 square feet.
R310.1.2 Minimum opening height. The minimum net clear opening height shall be 22 inches.
R310.1.3 Minimum opening width. The minimum net clear opening width shall be 20 inches.
R310.1.3 Operational constraints. Emergency escape openings shall be operational from the inside of the room without the use of key(s) or tool(s).
Aside from the required emergency escape route, very little has remained the same between the two codes.
The minimum net clear opening height does remain the same; however, the minimum total net clear opening requires 5.7 square feet (5 square feet, if on ground floor). The sash can no longer be removed to meet the minimum total clear opening. The minimum net clear width, without exception, requires 20 inches for all types of windows (including casement). Special provisions must be met when either the window's finished sill height or the door opening has a threshold height below the adjacent ground elevation.