Do compressor fridges need winter vent covers like my old motorhome fridge?
No not normally, a compressor fridge runs rather like a domestic fridge as it compresses a contained gas and needs only a modest amount of airflow that can be internal depending on design.
Your previous fridge was probably a three-way (gas, hook-up 230v AC and 12 volt DC powered) and this absorption process is driven by heat hence there can be some quite large external vents including a gas flue, in the winter or very windy days they benefit from having temporary winter vent covers fitted.
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