Well finished the duct work tonight. Never messed with duct before so please hold all laughter :lol:. I was on a shoe string budget after purchasing stove and chimney so i tried to reuse as much as i could. One thing i found out is that the older duct work is a lot heavier guage then the new stuff is. The flex duct is just temporary so that we can run gas furnace if needed until i get chimney finished.