Service over counter

means equipment that has sliding or hinged doors in the back intended for use by sales personnel, with glass or other transparent material in the front for displaying merchandise, and that has a height not greater than 66 inches and is intended to serve as a counter for transactions between sales personnel and customers. “‘Service over the counter, self-contained, medium temperature commercial refrigerator”, also defined in this section, is one specific equipment class within the ‘‘service over counter equipment family).