US Patent 11678766 Firebox for a grill

A firebox for a grill is provided. The firebox has a shell, an insulation layer, and a firebrick layer. The firebrick layer comprising a plurality of firebricks that form an inner peripheral surface of the firebox. The insulation layer formed between the firebrick layer and the shell or the insulation layer forming the outermost layer of the firebox. The shell preventing the collapse and/or unwanted airflow into the internal cavity of the firebox if a fracture is formed in the firebrick layer.