Did you seal outside vents after Residential refer install?

I sealed mine. You should end up with enough free air space around the coils of the fridge to allow cooling. Some of that is dependent on the model of fridge you have and clearances involved. Leaving the stack vent open on the top will surely ventilate the space. If it was mine, I'd probably close that up or restrict the opening. I do some camping in the Winter so having a big opening anywhere isn't a good thing.