We had taken out the chimney that had been used for the boiler. It was in very bad condition. Luckily there is an external chimney that was used for a small wood burning stove in the basement. We have a new boiler and will install it in that chimney. It needed a class B chimney liner. We planned to heat the house so we could work during the winter so it needed to be installed before it got too cold. The liner is double layered and comes in 4′ section that need to be connected together. Steven was up on a tall ladder installing 4′ sections at a time.