A plastic molded refrigerator pan and window assembly in which the front wall of the pan includes a large opening within which is disposed a separable snap-engaging clear plastic panel. The engagement is provided by upper and lower channels provided in the respective edges of the panel which engage opposing sides of the front wall adjacent the edge of the opening. Because of the generally unsupported and flexible nature of the front wall along the upper edge of the opening, the panel engaging structure includes tab portions of varying height which in certain areas snap into the respective opposing channel and at other areas require sufficient forceful displacement of the top of the wall to seat the tab in the flange so that unintended disengagement is prevented even at the most flexible area of the panel.