My recently purchased SMB doesn't have a furnace, we survived a few winter trips with a little buddy portable heater but won't do another winter like that.
I have a strange floor plan that must have been custom as it isn't one of the standard ones. The easiest location to add a furnace will put the furnace exhaust about 12" from the fuel fill door (Gas).
I have spent more than a few hours looking at pictures online and seems like SMB didn't put them that close together. Maybe there isn't any specific reason but it is an observation.
Is there any issue with the furnace exhaust being this close to the fuel fill?
I can't see anything in the furnace literature that says not to but wanted to get others opinions.