Adding fan behind refrigerator...worthwhile??
I have 3 RVs and I seem to be addicted to adding stuff to them....lol. They each have a standard Dometic 2852 absorption refrigerator. They seem to be working as expected. I did replace the cooling...
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I'm not in the same temperature zone as you are but without a doubt adding a 4 inch fan at the upper vent made a fair bit of difference. It was a 3 speed fan and I was lucky enough to have 2 unused spade terminals on the back of the fridge made for this, on all but the hottest days I had it on the lowest speed, 90+F days I upped it to med or high as required and wouldn't believe the heat coming out of the vent. It definitely dropped the interior fridge temps and sped up the cooling process by about 1/2 the time. I don't know what the dB rating was but I could barely hear it at night during quiet times. I don't know what the brand name was, just 12DV DC with a 3 speed switch.
