Refrigerator with cantilever shelves (have brackets that fit in rear wall supports) are tested for 35 pounds per square foot.
An example of the weight of an average refrigerator item would be a gallon container. It weighs 8 pounds, and a full width shelf can hold 6 of them. A quart container weighs 2 pounds, and a full width shelf can hold 24. The door shelves have no specific limitations.
Note: The above information also applies to non-cantilever shelves.
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