a window with specific release hardware and a minimum clear opening size to allow occupants to escape through the window in case of a fire or large enough for a fireman with an air-pac to enter. Each emergency escape and rescue window shall have a minimum net clear opening of 5.7 square feet (with bottom sash up and not removed). The minimum clear height dimension shall be 24 inches. The minimum clear width dimension shall be 20 inches. The maximum sill height shall not be more than 44 inches from the floor.

A window large enough, as defined by local building codes, for exit or entry in case of an emergency. Typically required in bedrooms.

Window designed to be large enough for a firefighter to climb in or a person to climb out in an emergency. U.S. building codes require each bedroom of a home to have an emergency exit window, with minimum sizes specified.