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When your original construction fire clay flue tile liners are cracked, the cracks open during the heating phase and allow gases to pass through to your chimney walls. The gases, being acidic, attack the masonry and will shorten the life of your masonry structure. In addition, this will lead to carbon monoxide in your home. Stainless steel chimney liners are needed to exhaust all poisonous gas and chimney smoke out of your home safely.
The NFPA (National Fire Protection Association) Code 211 requires that all masonry chimneys be lined. Unlined chimneys are so unsafe that researchers characterized building chimneys without chimney liners as "little less than criminal". The installation of fire liners in chimneys has been recommended since the early part of the 1900's.
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