Service over the counter, self-contained, medium temperature commercial refrigerator

means a commercial refrigerator -

(1) That operates at temperatures at or above 32o F;

(2) With a self-contained condensing unit;

(3) Equipped with sliding or hinged doors in the back intended for use by sales personnel, and with glass or other transparent material in the front for displaying merchandise; and

(4) That has a height not greater than 66 inches and is intended to serve as a counter for transactions between sales personnel and customers.