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How to Keep Your Fridge and Freezer Frost Free If your freezer is stuffed with leftovers or frozen food items, it won't defrost as easily as one that has sufficient space for air circulation. Keep your freezer clear to ensure proper air circulation, and take out leftovers on a regular basis. Refrigerators that automatically defrost (or those with manual defrosting) contain rods in the back of the freezer wall that warm up and melt frost. Frost-free refrigerators have a cooling fan that circulates the air. L