The side plate frame seals the area between height post and the side skirt (800mm wide cabinets) or the Vertical Mounting Rail (600mm wide cabinet). The side plate frame 150 and 250 provides adjustability in the depth direction of the Vertical Mounting Rails of 150mm or 250mm (this is measured from the front of the door) whilst keeping the high level of air tightness. In so called Closed-Loop cooling configurations this part is normally ommited as it may block hot and cold airflows.