I've had several RV's and never even thought about servicing a furnace.
And still won't.
I think it's a non issue and wouldn't worry about it.
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2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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