I guess its the same as at my house (or most newer homes here in SoCal). One duct and outlet, and the blower - in the attic - just blows air, either hot from furnace or cold from the a/c heat exchanger.
How you get not sick from the germ... boy, maybe im already sick... but trhere are companies making a living just cleaning ductwork, not sure if they can do the same in RVs.
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