There are several ways to skin this cat. The manufactured chimney pipes are good for tight clearances, but they are expensive. I am going to simply remove a section of the framed wall behind the stove and build a brick "wall" that extends into the room a couple inches, has an air space between it and the existing block wall, and it will be wide enough where it extends at least 9" from the pipe. Floor to ceiling, will provide the clearance from any combustible. This is clearly described in the NFPA 211 specs.
