Hi folks. Is it possible to use direct vent pipe on a B-vent stove? I have an old Lopi Spirit that is B-vent (4"). I'm planning on having the venting professionally installed straight up through the ceiling and roof. However, I'm just thinking that some day I might like a newer stove and a new stove would almost certainly be direct vent. It would be nice not to have to replace all the vent pipe. So...is there a way to convert/adapt a B-vent stove to use direct vent vent pipe? Thanks!