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Anatomy

Thimble

A sleeve fitting that lets a flue pass safely through a wall.

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All glossary terms

What is Thimble?

A UL-listed refractory or metal sleeve that carries a stove pipe safely through a combustible wall and into the chimney. On inspection we check its size and fit closely, because a thimble that is undersized or badly installed is one of the leading causes of wall fires we document.

Related terms:Pipe ConnectorClearances

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Other terms in the glossary

Creosote
Tar-like residue from incomplete wood combustion. Highly flammable.
NFPA 211
The US standard governing installation of chimney, fireplace, and vent systems.
Inspection Levels
Level 1 (annual), Level 2 (sale or event), Level 3 (concealed damage).
Flue
The internal passage that carries combustion gases up and out of the structure.
Liner
The inner channel of the flue, whether clay tile, stainless steel, or cast-in-place.
Crown
The concrete cap at the very top of a masonry chimney.
10+
Years
NFPA 211
Standard
CSIA
Certified
< 2hr
Response
Ready when you are

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Free written quote. Same-week scheduling. 24/7 emergency response when you need it.

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Licensed & Insured Same-Week Scheduling Written Quote, Always
Emergency

24/7 Response

Active leak, animal in flue, post-fire damage, or smoke event? Real humans on the line 7 AM to 12 AM every day — replies in under 2 minutes. Tech dispatch within 2 hours during business hours, subject to crew availability after-hours.

Emergency line
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