I had a wood stove with Selkirk pipe running through the roof. I took out the wood stove and am replacing it with a Breckwell Big E unit. The Selkirk double wall pipe extends about 12 inches into the living room. The Big E came with Duravent piping- Is there an adapter that I can use my Duravent pipe with the Selkirk pipe? Otherwise I will have to use Selkirk pipe exclusively -Thanks for your help-Rolf