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I took an approach similar to what KemoLondon did but with some variation about 2 years ago. I mounted two axial fans in the bottom compartment (behind the shroud) then installed 3 more at the top of the top compartment that blow straight out. I sealed all the voids around the top of the freezer with with metal tape to improve air movement.
In essence the bottom two force outside air up while the top three exhaust it to the outside. Mine are 110 volt with a remote control switch that I can turn on or off from inside (or outside) the coach. Proof is in the numbers. Before this mod, with the sun on the fridge side, temps would go from 38 to 45 degrees. Freezer struggled to keep at 36. Since the fan install, fridge stays between 33 and 36 while the freezer maintains 15 to 20 below zero. Keeps ice cream rock hard. Simple mod and well worth the cost.
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