Code requires cleanouts for every flue except fireplaces. However with the installation of an insert, this now changes the open fireplace former use. Is a cleanout access now required? I know of a couple of towns that, interpret the code to mean a cleanout must be cut in the masonry chimney to pass the insert installation inspection. The idea is appealing, as it would allow access to the rear of the insert connection, allowing cleaning without removal. If done before the installation, it would also make the final connection easier. With masonry blades readily available, the task is much easier to do than, the hammer and chisel routine. Another part of the cleanout code that gets overlooked its location in garages. You know the setup, where there is a chimney starts in the garage, for that family room fireplace. Garage cleanouts are forbidden for a couple of reasons. One,so gasoline fumes do not travel to the open fireplace. Two, Carbon Monoxide gas from car exhaust, escaping into the cleanout exiting into the living space. These cleanouts should be relocated outside.