{"id":"spark-arrester","license":"CC-BY-4.0","data":{"term":"spark arrester","shortDef":"Noncombustible corrosion-resistant metal mesh on a chimney or stovepipe outlet. CAL FIRE’s low-cost list names 3/8- to 1/2-inch openings. It is not an ember-resistant wall vent.","alsoCalled":["spark arrestor"],"doNotSay":["listed vent"],"relatedGlossary":["mesh","ember"],"relatedCategories":["roofing"],"relatedGuides":["hardening-ladder"],"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-23T00:00:00.000Z"}}