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Vented. You don't want all of that lint activating your allergies. And if you do any winter camping and run your furnace any you will accumulate moister inside the camper from the heat against the cold walls and windows. Blowing more moist air into the RV from the dryer is a recepie for a lot of moisture problems. If the dryer vent is properly installed and sealed, you'll have no problems with it. Just consult your dealer before you drill the hole. I had a friend who drilled where the sign said "drill here for dryer vent" and hit a stud.