Abstract: A device for protecting panes of windows and glass doors consists of a beam which may be removably engaged in mounting brackets at the sides of, or above and below, the pane, so that the beam is parallel to and spaced from the pane, one or more pressure pads being mounted on the beam for movement to an operative position against, and applying pressure to the inside face of the pane to counteract vibration or flutter of the pane. The beam may have a pelmet fascia fixed to it and, when not in use, may be supported inconspicuously above the window or door.