Ken, I believe the WD802 is a vented model and therefore will require you to cut hole for the vent. Here is the data sheet for that model:
Splendide, of course, makes a ventless model but for RV use, the vented models work much better as the exhaust is vented to the outside. A ventless model in an enclosed RV isn't good ...and the drying function takes forever and is extremely inefficient. In fact, it's almost like not having a dryer function at all it's so inefficient.
If the factory had installed the Splendide when new, it would have already had a flexible metal duct and a vent to the outside cut. You'll now have to do it yourself.