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Chimney Standard
Safety

Spark Arrestor

Screening at the termination, specified by mesh opening size.

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All glossary terms

What is Spark Arrestor?

Where required, the opening size is part of the requirement. Too coarse does not satisfy it; too fine clogs with deposit and becomes the blockage. On a wood-burning flue an arrestor is an annual check item precisely because its failure mode is choking the flue it was fitted to protect.

Related terms:Chimney CapCap

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Other terms in the glossary

Creosote
Condensed wood-smoke residue on the flue wall, graded by stage — and the stage is the finding that matters.
NFPA 211
The consensus standard governing chimneys, fireplaces, vents and solid-fuel appliances.
Inspection Levels
Three defined scopes — and the standard specifies when each is required, not which you prefer.
Flue
The passage carrying combustion products out — one appliance, one flue, correctly sized.
Liner
The barrier between combustion products and the building structure. A breach takes the flue out of service.
Crown
The sloped masonry cap on top of the chimney — the surface that fails first and costs most.
15+
Years in the field
NFPA 211
Checklist
48h
Written report
< 2hr
Response
Ready when you are

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Emergency

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