Outside/inside flue question

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Rearscreen

Minister of Fire
Dec 21, 2014
800
Vermont
Let's say theoretically I have an inside straight up flue 20 feet to the peak (+3') vs an outside triple wall freestanding to the same height, which would have a better draft at a 20 degree outside average?
 
Let's say theoretically I have an inside straight up flue 20 feet to the peak (+3') vs an outside triple wall freestanding to the same height, which would have a better draft at a 20 degree outside average?
inside mainly because its straight up
 
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