There has never been a filter for the furnace on any of the campers we have had. I have Jerry rigged a filter where the air return is just to keep a little of the dust away from the furnace. About the only other thing you can do is clean the area where the furnace is located.
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Roger & Cheryl Full Time since 2002, RVing since 1975 2008 Chevy 3500 Crew Cab Dually, 2012 RW 36RL
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