Hey everyone, I'm rejuvenating an old sloppy stove hookup. The burner is an Alaska Kodiak. It has a 6 inch outlet out the back. My chimney has a 7 x 6 3/4 square clay flue. The old setup had 6 inch pipe to a 6x8 reducer into the chimney. The hole in the chimney wall looks like it was done with a sledgehammer, filled with creosote, and just a disaster. Would it be better to stick a piece of 6 inch into the chimney wall and brick/cement it shut? This has to be better than butting a 6x8 reducer into the oblong disaster hole that is current. Any help will be appreciated!!