I have a different 34'.. 1999 Excella.. Center Bath, Streetside galley, rear Queen bed. Front to rear I have all at the floor level outlets:
- front of Galley cabinet facing bow
- under sink, facing the dinette
- in Bath, just AFT of the shower
- in rear Bedroom on Streetside.
I do not know how much is ducted or where, under the belly. However, I do believe that it should be ducted near the fresh water tank, or between the fresh and black tanks.
Peace and Blessings..