Originally Posted by DD788Snipe
You have 2 vents. One on the shower pan and the other is at the bottom of the vanity. These are exit vents. When the central heater is fired up and that fan switch in the wet bay is turned on it will pressurize the wet bay with heated air that exits back into the coach to be reheated thru those vents. Good luck with your remodeling project. Newmars are great rig's to work on. I've changed my flooring and TVs and still looking into upgrading other things.
Sorry - I didn't explain what I found thoroughly enough. The vents at one time have may been for central heating, but the previous owners converted the rig to all-electric, removed the furnace and the LP tank and replaced the entire floor with tile and electric radiant heating. There may have been ducting at one point, but not anymore
Sorry for any confusion.