I mentioned this last month in another posting, only to get one of the so-called know-alls on this forum pouring scorn on the problem.
We had a Bailey Pageant Vendee, which was a very draughty caravan, and very cold at this time of the year. As you have described there were vents under the floor below the cooker and the fridge, as well as the two normal fridge vents. Under the fridge and cooker themselves were two large air spaces into the caravan.
First, did you fit winter covers to your outside fridge vents, this would have helped.
Second, if the draught is blowing in under your fridge, there must be somewhere else where it is getting out. In our van there was a massive 1cm gap all round the large front roof vent. You could actually get your fingers between the vent cover and the sides of the vent. This was normal apparently.
For adequate ventilation you do not need anything like this ventilation area, I think these days some of the caravan manufacturers work on the overkill principle. You end up with no condensation, but then you have a van which is very draughty and difficult to keep warm when used early or late in the season.
We changed to a folding camper from the Bailey and it was far less draughty!
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