In some kinds of situations of the fire that passageway has been blocked in accident. No matter what you do, you cannot escape from the fire through the door. To find a solution for trapped person get away form the fire quickly, the team find the point in window frame redesign. X-Space is redesign of the window frame including rotational structure holder. When fire coming up, all family members can easily get out of the fire through the X-Space avoiding the injury from the fire and smoke behind the outer wall.