A thin coat of mortar applied to the inside of a masonry chimney or to the walls of a smoke chamber designed to reduce the resistance of flow in the chimney system.
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See AllDeposits of hydrocarbons that were in the smoke going up the chimney that have condensed into a solid form.
(also referred to as a Saddle) A ridge that extends from the back of the chimney to the slope of the roof, with the purpose of shedding...
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