On Jan 23, 12:54*pm, wrote:
When we lit the stove at xmas smoke came out of the back. Filled the
house with smoke. Checking it today for the first time, there are 2
outlets for the 6-inch pipe that go to the chimmney. The unused one
one the back has a crack and fell off when I touched it. How do I
reattach it. There are no screws or anything. Just an insulation ring.

Post pictures, diagrams, sketches of the layout. Much, much more
information needed to assess the situation for a sensible solution.

Joe