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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 were empty. If you want to avoid freezing frost, make sure your freezer is empty to allow for good air circulation and remove any leftovers as often as you can. Fridges that automatically defrost (or those with manual defrosting) include rods at the back of the freezer wall that heat up and melt the