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How to Keep Your Fridge and Freezer Frost Free If your freezer is filled with leftovers and frozen food, the air will not circulate as well as it would if it was empty. Keep your freezer empty for adequate air circulation, and remove leftovers on a regular on a regular basis. The freezer's back walls on refrigerators that automatically defrost or those with manual defrosting are fitted with rods that are heated and melt the frost. Frost-free refrigerators have a fan that circulat