Another option, which I have not used myself, is used a lot in Houston. https://www.plylox.com/ This company sells a clip that is attached to 1/2"plywood, and you can typically get them at your loca ... read more
Interior chimneys are at least 4" larger in all four directions than the flue they contain. A chimney containing a 12"x12" clay flue liner must be at least 20" by 20". Combustible materials must be ke ... read more