Product review (4 stars): Have an experienced tradesman install it.
The instructions made me yearn for Chinese picture directions! Not good. They referenced parts that were not included. The infamous adjustable bracket was unusable. The brace for the chimney was not included. I think it would have been easier to install  for new construction. I used my skills to make it all work including drilling additional holes in chimney for support. That said, I love its operation! Quiet, powerful, easy to use and looks smart. I would buy it again.