we have a 36' gas wolf stove. purchased the vent-a-hood to use. The builder did not a lot for this and now I have a main floor joist above the stove. We can cut it out and run a soffit but that soffit will run right thru my sons room. Is it possible to make a turn in the vent duct to have it go down and run under the house in the crawl space (about 3 feet in space) and out the side of the house that way instead of going thru the roof?