Our 2015 23D has the the upper and lower side vents for the refrigerator space. The solitary fan installed by Airstream in the middle the top vent was totally useless in keeping the refrigerator cold. We completely blocked off the top vent and put in three fans in a metal plate. Now all the cooling air has to come in the bottom vent and pass by the cooling coils enroute to the top exit. The fridge never had a cooling issue after this modification.
The fans were wired to come on via a lighted manual switch when the Dometic fridge was in place. Now that we have a freon based compressor, whenever it comes on, a relay pulses and starts the fans until the compressor turns off.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic w/ twin beds, 50 amp service, 1000 watt solar system, Centramatics, Tuson TPMS, 12" disc brakes, 16" tires & wheels