Place boards or heavy cardboard on top of packages. Place dry ice on top of boards. In an upright freezer, place ice on each shelf. You may cover the freezer with blankets, quilts or some other covering, but do not lock it or cover air vent openings. It will help to put crumpled newspaper or excelsior between the cabinet and the blankets.
Gas given off by the dry ice needs a place to escape.
Open basement or room windows or doors to vent out gas from dry ice. Power Failure Most chopped meats, poultry and seafood sandwich fillings should not be left without refrigeration for more than two hours. If you have to leave your home without an ice chest containing ice, take cold salad ingredients to mix and eat as soon as you arrive. If any salad is left, throw it away. You can extend your food supply by cooking all unspoiled meat immediately.