Most current fridges have a fan on the cold side to circulate the coldness all around, and rely just on convection to pull away the heat (excepting RV propane fridges, which don't have a cold-side fan and have very uneven temperatures, but do have a hot-side fan because otherwise they don't work on hot days)
Having had the evaporator fan go out in an old fridge once, I think you'll find fridge fans not as generic nor replacements as easy to find as you might hope.
> and rely just on convection to pull away the heat
Interesting, I've definitely seen a normal sized house fridge with a fan on the hot side, but I don't know what is typical.
> I think you'll find fridge fans not as generic nor replacements as easy to find as you might hope.
Current generation probably not, but there's no reason these can't be your typical $20 computer case fan, especially on the hot side where there's no worries about condensation... for peltier elements you could even stick a off the shelf CPU heat sink on top (though presumably at scale you would build the heat sink custom).
Having had the evaporator fan go out in an old fridge once, I think you'll find fridge fans not as generic nor replacements as easy to find as you might hope.