Evening all just putting together my muti fuel stove and getting to the point of sorting the flue out. In my unit there is a 8 inch ducting/flue pipe which has been left installed from where a previous oil burner was installed. Am i right in thinking this spiral ducting/flue is ok for my burner seen as it has been used previously or is it not up to the job? Dont fancy co2 poisoning so though i would ask the question. Many thanks