Patent ID: 7462657

Claim:
A building comprising: a plurality of walls, wherein at least one of the walls includes a door frame defining a doorway; a roof supported by the walls; a door coupled to the door frame by hinges so as to be disposed across the doorway, wherein the door comprises: a rigid internal frame having at least four tubular members that define a shape for the door system, wherein each tubular member comprises four continuous outer walls that define an open interior; an interior sheath attached to said internal frame, wherein the interior sheath has an outer periphery defined by at least four outer edges; an exterior sheath attached to said internal frame, wherein the exterior sheath has an outer periphery defined by at least four outer edges; and exterior trim attached on said exterior sheath; wherein the internal frame is positioned between the interior sheath and the exterior sheath and forms a generally rigid door that resists bowing; and wherein the internal frame comprises tubular metal members disposed in a rectangular configuration with exterior edges, and wherein the outer edges of said interior sheath are flush with the exterior edges of the internal frame.