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Safety

Spark Arrestor

The mesh screen on a chimney cap that keeps embers from escaping into the air.

All glossary terms

What is Spark Arrestor?

The wire mesh part of a chimney cap. NFPA 211 puts the mesh openings no smaller than 3/8\" and no larger than 1/2\", tight enough to stop sparks (it must not let a 1/2\" sphere through) yet open enough to keep the draft moving. Wildfire zones and plenty of municipalities require one.

Related terms:Chimney CapCap

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