A patient flatwall system comprises a generally horizontal track extending generally parallel and adjacent to a wall of a hospital room, and at least one patient flatwall coupled to the track for movement therealong and for rotational movement relative thereto about a generally vertical axis. The cold inlet duct receives a cold steam from a cold inlet spiral and directs it into the hot inlet duct in such a way that a boundary layer of cold steam is formed over the rotor circumferential surface between the outlet end of the cold inlet duct and the blade and vane rows. The air-core coils of bigger sizes are uniformly arranged on the commutator member, so that high efficiency and easy Installation can be achieved. The first roller bearing is designed as an open bearing which is lubricated by an operating medium. A second plurality of n-dimensional components located on an outer perimeter of the image that abut or overlap at least one side of one m-sided cell in the grid is then identified.