RT6 Freezer box version has a 405 square inches of plate surface area, and 0.65 cubic foot of volume (14"W x 6.75"H, and 12.0"D). The RT6 model is typically mounted horizontally, but can also be installed vertically.
RT4 model has 336 square inch plate surface area, formed into a box freezer which is normally mounted vertically, like a bucket in the bottom of the cold box.
Three plate model, recommended for "spill over" design usage; where the cold box is divided and one part of the box becomes freezer, and the other section a refrigerator.
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