Damper

The valve that opens/closes the flue.

What is Damper?

The metal plate or valve that opens to let smoke escape while a fire burns and closes to seal the flue the rest of the time. There are two kinds: the throat damper sitting above the firebox in older setups, and the top damper mounted at the very top on newer ones, which seals far better and cuts heat loss by 30% or more.

Related terms:FlueTop-Sealing Damper

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Other terms in the glossary

Creosote

Tar-like residue from incomplete wood combustion. Highly flammable.

NFPA 211

The US standard covering how chimney, fireplace, and vent systems are installed.

Inspection Levels

Level 1 (annual), Level 2 (sale or event), and Level 3 (concealed damage).

Flue

The inner passage that carries combustion gases up and out of the house.

Liner

The inner channel running through the flue, made of 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

Talk to a CSIA-certified expert today.

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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