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Safety

Spark Arrestor

The mesh on a chimney cap that stops embers from escaping.

All glossary terms

What is Spark Arrestor?

The wire mesh component of a chimney cap. NFPA 211 specifies mesh openings no smaller than 3/8" and no larger than 1/2" — small enough to catch sparks (the mesh must not pass a 1/2" sphere) but large enough to allow draft. Required in wildfire zones and many municipalities.

Related terms:Chimney CapCap

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