An insulated window or door (referred to as IG, thermopane, dual pane, double pane, or triple pane) contains two or more layers of glass together in a track or frame. The space between the glass layers is usually filled with dehydrated air. The perimeter of the glass is sealed, which prevents movement of outside air into the space. When the window seal fails or the glass is damaged, which allows moisture-laden air into the space. This causes fogging or clouding on the inside of the window.