Dear Johny, the Fridge Doctor disagres with you.
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part that is often deemed unnecessary and in a lot of cases ends up missing, is the cardboard cover over the compressor housing area at the back near the floor that sometimes has insulation attached to it. Over time the attachment holes of the cardboard rip out on one side and because it just a piece of cardboard, many times it is discarded. However, as stated previously, this part has a purpose or it simply would not be there. You can be assured the engineers that designed the refrigerator would not go through the trouble of making the part and getting it attached it to each and every unit on the assembly line if it wasn't there for a reason. In a forced air condenser design, the cardboard deflects the air moved by the fan to cool the compressor then evaporate the condensate water. On static condenser designs, the cardboard ensures the compressor operates at its optimum temperature, directs air flow through the proper channels, and in some cases serves as an acoustic baffle.