Rich,
I have a 32V, 2003 Brave, which is the same floor plan as yours. I haven't heard that before, but you might want to check the vacuum connections on the vent doors to see if there is a leak and you're hearing the vents cycle to the position of the heater/air conditioner controls.
Since the MH is still in warranty, I'd let the dealer participate in the mystery.
W8RLM - Bob
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2006 Winnebago Journey, Model 39K, 2013 Dodge Dart
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