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Columbia Installation and Operation Manual8.2.3 Masonry ChimneysThe stove may also be connected to amasonry chimney, provided thechimney complies with the constructionrules found in the building codeenforced locally. The chimney musthave either a clay liner or a suitablylisted stainless steel liner. If themasonry chimney has a square orrectangular liner that is larger in crosssectional area than a round 6” flue, itshould be relined with a suitably listed6” stainless steel liner. Do notdownsize the flue to less than 6” unlessthe venting system is straight andexceeds 25 feet in height. Whenpassing through a combustible wall, theuse of an insulated listed thimble isrequired.8.3 Minimum Chimney HeightThe top of the chimney should betall enough to be above the airturbulence caused when windblows against the house and itsroof. The chimney must extend atleast 1 m (3 ft.) above the highestpoint of contact with the roof, andat least 60 cm (2 ft.) higher thanany roof line or obstacle within ahorizontal distance of 3 m (10 ft.).37