Our freezer has been in use for over 30 years. It has 3 coil shelves and the bottom of the freezer as the 4th shelf, and it takes several weeks for severe frost to form. Is always. I bought 2 packs of these. I defrosted the freezer, placed one on each shelf, then turned it back on. Once the temperature reached the right temperature, we put all our products in the freezer and used them normally for the past few months. Although all shelves have a very light layer of frost, none of them are more advanced. It's like snow dust on a wire shelf, if that makes sense to those who don't live in the great white north. I'm amazed at how well they worked. I cannot recommend them enough.
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