A proposed refrigerator embodiment comprises a body enclosing a lower fresh-food compartment at above-freezing temperatures; a freezer disposed above the lower compartment, an intermediate-temperature compartment disposed above the freezer both operating at below-freezing temperatures. The freezer is separated from the intermediate-temperature compartment by its top wall, from the lower compartment by its bottom wall, and from the body's walls by its sidewalls and rear wall with a gap therebetween. The freezer's walls have predetermined thickness and heat conductivity, for passing certain cold flows through, thereby arranging predetermined temperatures in the compartments. The gap around the freezer's top wall is filled by sealing means, preventing warmer airflows from the lower container into the intermediate-temperature compartment. A rigid net, rested on supporting means fixed to the body, supports the freezer. Another net can be mounted above the freezer to support items in the intermediate-temperature compartment. A screen sheets embodiment is also disclosed.