What is Thimble?
A UL-listed refractory or metal sleeve that lets a stove pipe pass safely through a combustible wall into the chimney. Improperly sized or installed thimbles are a leading cause of wall fires.
Related terms:Pipe ConnectorClearances
All glossary terms
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Other terms in the glossary
Creosote
Tar-like residue from incomplete wood combustion. Highly flammable.
NFPA 211
The US standard for chimney, fireplace, and vent system installation.
Inspection Levels
Level 1 (annual), Level 2 (sale/event), Level 3 (concealed damage).
Flue
The internal passage that carries combustion gases up and out.
Liner
Inner channel of the flue — clay tile, stainless steel, or cast-in-place.
Crown
The concrete cap at the very top of a masonry chimney.
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