This frost top unit features a stainless steel top that is elevated by 1 inch and includes a drain trough and a 2-inch overhang. The exterior housing is made of galvanized steel. It has an on/off toggle switch and self-contained refrigeration with R290 refrigerant. The unit requires a cutout of 30-3/4" x 25". It is cUL, UL, and NSF certified. We also offer other frost top and cold slab units.