Morning guys, thanks for your replies, Derek, Robin hood, you are of course exactly correct, the separate vent is for the fridge, heater vent is near bottom of van body
So I need two covers that are 440 x 130 as I've seen advertised this allows for a 15 mm gap as Keith rightly says for air circulation,
would this be neccessary if using fridge on 240 volt only, we have just been away and the cold air coming in through the vents, you can feel the cupboards are really cold when you open them
Incidentally I have found the set of three winter covers from our Hymer a class with thetford fridge if any one is interested? Unfortunately won't fit our current van