Originally Posted by SeaDog
I would suspect the squirrel cage has move or come loose due to the vibrations of driving. JMHO
Many furnaces have a "dual" squirrel cage fan.
One side pulls air into the combustion chamber (from the outside intake/exhaust) for burning the propane, the other side blows/moves the air inside your R/V. (these two chambers are separate and do not mix)
Something could have gotten in either side and is making noise.
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