Sprite musketeer eb 2012 microwave

Can't help you with your questions but manufacture fitted microwaves are vented to the outside from what I have seen. It may be worth checking this with the manufacturer. It will also use up some of your user payload. 

FWIW, ours has a factory fitted microwave and we very rarely use it.

A quick google brings up this spec:

https://www.tilshead-caravans.com/2012-sprite-range

The microwave was a dealer fit option, not standard. So it may not have had one fitted in the first place.

Later Swift caravans had a Cata microwave fitted. Often above the hob/oven and in the confined space at the wall/ceiling interface that subjected them to moisture/condensation and failure at around 2.5 to 3 years age. Current models have the microwave not above the hob/oven.

Another issue is a domestic microwave is not suited to being thrown across the country in a wobble box, as advised by Cata technical department when I enquired about repairing our failed one.

The Cata MW was also fitted such that insufficient air gap at the sides effectively blocking off the vents.

You may be better off taking a cheap MW on your travels. I replaced the factory fitted Cata with a cheap Sainsburys home 17litre manual microwave unit that has sufficient air gap around it. I used the fittings off the Cata in a different position. Image below

Thanks for your reply.

I was looking for a 20litre mw but think 17 litre will be better re ventilation.