{"id":"cal-fire-chimney-screen","license":"CC-BY-4.0","data":{"title":"CAL FIRE chimney and stovepipe screen openings","shortName":"CAL FIRE chimney screen","summary":"CAL FIRE guidance specifies metal chimney and stovepipe outlet screens with openings from three-eighths to one-half inch.","framing":"Product dimensions and material can address the screen line. Chimney type, draft, installation, cleaning, and local fire code remain project questions.","kind":"guidance","instrumentId":"cal-fire-home-hardening","jurisdiction":"California","placeIds":["us-ca"],"appliesToCategories":["roofing"],"quotedText":"3/8-inch ... 1/2-inch","source":{"title":"Hardening Your Home","url":"https://www.readyforwildfire.org/prepare-for-wildfire/hardening-your-home","publisher":"CAL FIRE","sourceType":"official","accessedOn":"2026-08-24T00:00:00.000Z"},"constraints":[{"attribute":"assemblyRole","op":"eq","value":"chimney-spark-arrestor"},{"attribute":"meshSizeInch","op":"between","value":[0.375,0.5],"unit":"inch"},{"attribute":"material","op":"in","value":["copper","galvanized-steel","stainless-steel","steel"]}],"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-24T00:00:00.000Z"},"applications":[],"products":[{"id":"weathershield-wsa-half-inch-screen-chimney-cap","name":"WeatherShield WSA chimney cap with half-inch screen","url":"/materials/weathershield-wsa-half-inch-screen-chimney-cap/","categories":["roofing"],"complianceStatus":"attribute-match","documentedAttributes":[{"attribute":"material","value":"stainless-steel","source":{"title":"WeatherShield Model WSA specifications","url":"https://lindemannchimneysupply.com/content/PDFs/ProductPDFs/product/WeatherShield%20Model%20WSA.pdf","publisher":"Improved Consumer Products, Inc.","accessedOn":"2026-08-24T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null},{"attribute":"meshSizeInch","value":0.5,"source":{"title":"WeatherShield Model WSA specifications","url":"https://lindemannchimneysupply.com/content/PDFs/ProductPDFs/product/WeatherShield%20Model%20WSA.pdf","publisher":"Improved Consumer Products, Inc.","accessedOn":"2026-08-24T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null},{"attribute":"assemblyRole","value":"chimney-spark-arrestor","source":{"title":"WeatherShield manufacturer product notice","url":"https://www.oregonchimneysweeps.com/wp-content/uploads/2019/02/snews-2018-08.pdf","publisher":"Improved Consumer Products, Inc.","accessedOn":"2026-08-24T00:00:00.000Z","sourceType":"manufacturer"},"documentLocation":null,"excerpt":null}]}],"matchContract":"Products appear only when their cited fields satisfy this requirement's normalized constraints. Application scope and unresolved predicates remain separate; an attribute match is not a permit decision."}