an improved enclosure including the use of a seamless urethane gasket which is continuous and formed in situ on a planar surface , with no requirement for the gasket to be formed in a groove or for additional backing structure to be added . the enclosure also includes the use of concealed hinge with cutouts positioned on the door to permit at least a 180 ° swing . the hinges are located outside of the sealing surface and do not overlap it , permitting the entire opening to be used , such that a full front window may be incorporated into the door without interference from the hinges .