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How to Keep Your Fridge and Freezer Frost Free If your freezer is filled with leftovers and frozen food items, the air will not circulate as efficiently as if it was empty. If you want to prevent freezer frost, make sure your freezer is empty to allow for good air circulation. Also, take out any leftovers as often as you can. Refrigerators that automatically defrost (or those that have manual defrosting) contain rods in the back of the freezer wall. They heat up and melt frost. Frost-free refrigerators have a fan that circulates air. LG's Total No F