a microwave oven comprising an enclosure including a wall member defining an opening for providing access to a heating cavity , the wall member having a continuous uninterrupted planar surface portion substantially surrounding the access opening . a door is provided for closing the opening in the wall member , the door having a continuous uninterrupted planar surface portion positioned , when the door is closed , opposite and substantially parallel to the planar surface portion of the wall member . an energy seal comprising walls defining a sealing cavity is formed in either the wall member or the door , the sealing cavity extending in a longitudinal direction to substantially surround the continuous uninterrupted planar surface portion of the member in which it is located . a segmented partition wall is interposed between the walls of the sealing cavity thereby separating it into two longitudinally extending spaces . a path is formed by the opposing planar surface portions of the wall member and the door which extends from the heating cavity to the sealing cavity resulting in substantial reduction , in combination with the sealing cavity , in the amount of microwave energy leaking from the heating cavity when the heating cavity is radiated with microwave energy from a microwave generator .