had a customer today ask if they could build a chase around an existing lined exterior chimney. The chimney has a flagstone veneer applied to the outside and it is deteriorating
What's the code???
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shure, why not? the liner inside the flue which is inside the chase is well away from any finished materials.
Remember if using combustibles to build the chase it will require a 2" clearance. Of course that depends on the AHJ. NFPA211-21 "Minimum air space 7.3.1.5.1 Clearances shall be based on good engineering practice and acceptable to the AHJ."
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