Abstract: A spacer bar for use in double glazed windows is disclosed. The spacer bar is an elongated tube or conduit having a generally rectangular cross section. The spacer bar has two pairs of opposing planar faces. Each planar surface of one pair lies against the interior surface of one of the glass panes of the double glazed window and one planar surface of the other pair faces the space between the panes and the other planar surface of said other pair faces the atmosphere. A small diameter tube passes through the surface facing the atmosphere. The portions of the small diameter tube lying on either side of the conduit surface are bent downwardly. The portion of the small diameter tube which lies inside the conduit is bent downwardly and extends to a point at least 5 inches below its entry point and the other portion of the small diameter tube which lies outside the conduit is also bent downwardly so that it lies adjacent to and generally parallel to the outer face of the conduit.

Abstract: A novel spacer bar for an insulating glass unit and an insulating glass unit filled with the spacer bar are disclosed. Deflection of the panes of the insulating glass unit, however caused, is essentially eliminated by the functioning of the spacer bar. The spacer bar is so constructed that a protion of its surface in contact with the space between the panes (inner surface) is perforated and a portion is imperforate and the opposite surface of the spacer bar has a small opening in its surface, which opening is opposite the imperforate portion of the inner surface. Means to place the small opening in communication with the exterior atmosphere is provided.