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How to Keep Your Fridge and Freezer Frost Free If your freezer is with leftovers or frozen food, it will not defrost as easily as one with enough space to allow air to circulate. If you want to prevent freezer frost, make sure your freezer is completely empty to ensure circulation of air and take out any leftovers as often as you can. The freezer's back walls on refrigerators that automatically defrost or that are manual defrosting, are fitted with rods that are heated and melt the frost. Refrigerators that are frost-free have a fan that circulates air. Total No