Still waiting on my installer who came out last Friday to give me an estimate to get back with me on the price. I am getting kind of ticked. Oh well. After looking at my stove wishing it were installed I have a question. The opening coming out of the stove is 8" outside dia. and 7" inside dia. The class A pipe I have is 7". So would I need a reducer. And am I suficating the stove. Any help would be appreciated.