Abstract: A burn building for training firefighters includes a burn room with a ceiling and at least one building entry into the burn room. The burn room has at least one exterior wall where a heat generation unit is mounted, and the heat generation unit is directed into the burn room. A barrier panel in the burn room permits exposing and covering the heat generation unit. The barrier panel is raised and lowered by air operated pistons and cylinders. The heat generation unit is operated from a control panel. A rack is suspended from the ceiling to hold wood pallets which generate smoke when heated to combustion temperature. A light is located at the building entry to indicate when to enter the burn building and the burn room.