If you just block off from the back of the refrigerator box itself, NOT THE FINS, ETC. so the air can vent off the fins and coils, you should be ok to use that space as storage. I would suggest adding 2 computer fans at the bottom (just above the burner) that blow air up across all the tubing, fins, etc and out the top. If the outlet is on the side, fabricate a smooth alum sheet metal curve to direct the air out the side.
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