Increasingredients air flow for a dometic refrigerator

I would (and have) perfected the installation before going to a fan. I have found manufacturers don't follow the guidleines that closely and much can be gained from improving the "chimney", checking that the clearances are per spec. and that there is no roof material blocking the top vent.
I have never had a cooling problem even in tripple digit temps on electric after correcting all these installation defects.