I am not in a mobile home just the duct work is in the crawlspace. I also cannot have an owb due to neighborhood regulations. Hence why I wanted a downdraft add on wood furnace. Couldn't find one one so I made one.
My gas furnace is down draft , basically a air handler now . No gas is hook up to it ,I just pipe the heat from the wood furnace , in the top of the gas furnace . No I never seen a down draft wood furnace . Getting around this not very hard .