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Safety

Spark Arrestor

The mesh across a chimney cap that keeps embers from drifting out.

All glossary terms

What is Spark Arrestor?

Inside every chimney cap sits its wire mesh, the spark arrestor. NFPA 211 holds the openings between 3/8\" and 1/2\": the mesh must not pass a 1/2\" sphere, which is what stops sparks, while staying open enough that draft is never choked. Wildfire zones and many municipalities require one.

Related terms:Chimney CapCap

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