US Patent 11276323 Modular building fire fighting simulator

A modular building system, includes a building unit which is formed of a framing system, at least one door module, at least one window module, and wall panels. The framing system includes a floor, a ceiling, and four corner columns secured between the floor and the ceiling. The door module is temporarily secured between the floor and the ceiling along the perimeter of the framing system. Likewise, the window module is temporarily secured between the floor and the ceiling along the perimeter of the framing system. The wall panels are secured between the floor and the ceiling around the perimeter of the framing system to enclose the building. The door module and the window modules are interchangeable.