BRRRRRRR-Where is That Draft Coming From?

We are replacing the Norcold fridge with an LG Residential fridge so it is pulled out. This leaves the outside fridge vent exposed and allowing cool air to come in from outside.
You can see part of the vent here-


We decided to find a way to seal those vent holes and this is what I came up with:
This is the thick black foam that was used as packing- I cut it into a strip and then sliced it almost completely through so  I could push the fins into the foam-and have the foam fill in the openings.

We then took strips of "Eternabond" (this should be in every RVer's  'Must Have' kits!) and sealed the foam and openings  completely.

The vent cover had to be put back up before it was completed- but it definitely made it easier to take a picture!