Abstract: A door is pivotally mounted to a support panel by means of right and left outwardly directed mounting studs positioned on the support panel which are adapted for insertion within a respective aperture in a lateral portion of the door. The door is free to pivot about the mounting studs in a vertical direction and includes a pair of tabs extending from a lower portion of the door toward the panel. Each tab is aligned with a respective resilient biasing arm extending from the panel toward the door. Each door tab is engaged by a respective biasing arm when the door is moved toward the closed position so as to urge the door to the full closed position in which it is maintained by the biasing arms. When the door is opened by rotating it about an axis aligned with the mounting studs, the tabs are displaced from engagement with the biasing arms and the door is free to assume the full open position wherein it is maintained in a generally horizontal orientation by rotations stops.