EPA Wood Stove Odd Chimney size inside diameter question.

[Rick1]

I have a Drolet Austral 70,000 btu EPA wood stove. I am in the planning stages of installing the stove. I know a guy thats getting rid of some old class A stainless chimney pipe thats maybe from the late 70's but in good shape. The problem is that he says that the inside diameter of the pipe is 6 1/2" and the outside diameter is 9". I have never herd of 6 1/2" inside diameter Class A stainless stove pipe. I have not seen the pipe yet and would like to. If in fact the pipe is 6 1/2 inside diameter would that be a problem since the stove calls for 6'' pipe. I am planning to have a chimney height of 17'.

 

[begreen]

I'd go new unless absolutely sure that I could still get every matching piece necessary for the old pipe. Otherwise it could be a can-o-worms.

 

[Rick1]

Going with new pipe sounds like it would be easy and straight forward, but very spendy compared to Free (Class A pipe at least). My biggest concern is the pipe diamater difference from a smaller 6" to a larger 6 1/2" ID and how it would impact the operation of the stove, draught, and creosote. And obviously second concern is of course matching up the 2 differnt sizes comeing off the stove to the Class A safely and correctly. Would it be a mistake to increase the pipe diameter from the recomended 6" to 6 1/2". Thanks for all the help!

 

[Todd]

I don't think the 6.5 would effect the draft at all. Many people have good results exhausting a 6" into an 8" chimney. The problem would be the connection, maybe you could have a metal fab place make something for you. Make sure you do a good inspection of that pipe to make sure it is class "A" and still good.

 

[EatenByLimestone]

You are literally playing with fire! Are you sure it's worth the pennies saved?

Matt