I just did that very replacement.
Was able to reuse one of the solair vent holes, need to enlarge it 3 1/2".
Blocked up the new furnace to get the vent alignment right. Installed the plastic inlet adapter pipe in the new furnace with a piece of plywood centered on the opening with a pilot hole. Slid the whole mess up to the side wall and glued the plywood with gorilla glue. Now you KNOW where the exact center of your vent is. Use a new 3 1/2" hole saw, and slowly, cut the opening.
I made a plywood wedge block that had a 10 degree angle on it that I attached to the inside of the coach with heavy duty construction adhesive and stainless screws from the outside, underneath the new trim.
I plugged the forward old vent hole with West Marine Epoxy/glass/filler, available as a kit, smaller quantites, premeasured. Very little mess.
On our 75 Eleganza II, I made a replacement plenum that allowed me to use all of the existing venting that headed aft.
The new furnace works very well. Ours is the 30,000 BTU model, which uses the same size enclosure as all of them in the same series.
The approach that I took, met all of the manufacturers recommendations for installation. Used all of the manufacturers parts only. Don't like the idea of using flexible coaxial tubing for something like this, possibility of restrictions, etc.
I did have one additional issue with this piece. Low voltage. Had to run a new ground wire to clear that up.
I wish that the fan was a little quieter, or if a two speed fan option was available, I would get it. It is nice to get warm fast, like when just getting back from the slopes skiing, but it would be nice also to not get woken up at night everytime the furnace comes on.
A new 10 year battery life smoke/carbon monoxide detector should also be installed when you are done.
>
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> If it is my coach(I am still running a sol-aire and want to replace it soon) -
>
> I would go with a 35000 BTU SF35 suburban. They can be bought from adventure RV, I am sure Applied.
>
> you can make a stand to help fit it to the wall, or I have seen some buy some high temp silicone hose and make it work.
>
>
http://www.gmcmhphotos.com/photos/furnace/p47917-sf-35-installed.html
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http://www.gmcmhphotos.com/photos/g5082-furnace-replacement.html
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https://thesartonshow.com/preparations-continue/
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> can't remember where I seen the photos of the person who used the flexible high temp silicone hoses for the exterior vents.
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>
>
> --
> Jon Roche
> 75 palm beach
> St. Cloud, MN
>
http://lqqkatjon.blogspot.com/
>
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