They are totally covered. If you look at the deck plans, stay away from the decks with the big white section in the middle. That's the intake/outtake for the ventillation from their recycling. When had a room on Dolphin and the balcony was huge!!! Problem was the smell. When we were moving, it was OK but got really loud from the vents. When we were docked, the sweetish garbage smell was evident.
I've posted some photos - go to the gallery and search for Diamond New Year.