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What is the Requirement for Separation Between Masonry Flues in a Multi-Flue Chimney?

April 26, 2017chimney flues masonry requirement Separation

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What is the Requirement for Separation Between Masonry Flues in a Multi-Flue Chimney?

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Our photo (left) shows three masonry flues in a common chimney, each separated by just an inch or so. The problems with this design include fire and gas safety hazards – an opening may develop between the flues causing draft interference between them and even inadvertent down-draft of dangerous flue gases from one chimney flue into another (and possibly out through a fireplace or heating appliance).