Originally Posted by bikendan
I don't know of any RV furnace that has a filter.
I believe it's against code for RV propane furnaces.
The furnace in my last two trailers just drew air from the area behind all the drawers and under sink area. There was one large grill on the kitchen wall but air could come in from anywhere.
Only thing to do is to keep the trailer as free of dust as possible and avoid traveling with a cat