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CAL FIRE chimney and stovepipe screen openings

CAL FIRE guidance specifies metal chimney and stovepipe outlet screens with openings from three-eighths to one-half inch.

Product dimensions and material can address the screen line. Chimney type, draft, installation, cleaning, and local fire code remain project questions.

guidance · California · Last verified 2026-08-24 · JSON (CC BY 4.0)

Published requirement text

“3/8-inch ... 1/2-inch”

Hardening Your Home — CAL FIRE

Where this instrument is documented

Instrument cal-fire-home-hardening.

Set a location to read how this instrument lands where you are.

No sourced application record joins this requirement to a place. The quoted text stands on its own; local reach is unknown.

Each place page carries that place's boundary, project scope and open official checks in full; this page's JSON twin carries them per application.

Machine-readable constraints

Attribute	Operator	Value	Unit
assemblyRole	eq	chimney-spark-arrestor
meshSizeInch	between	0.375–0.5	inch
material	in	copper–galvanized-steel–stainless-steel–steel

Products with documented matching attributes

Open the Build rules that quote this requirement

Product	Category	Status	Documented match evidence
WeatherShield WSA chimney cap with half-inch screen	roofing	Attribute match	3 cited fields Material: stainless steel Mesh opening: 0.5 in Assembly role: chimney spark arrestor

Sources

Hardening Your Home — CAL FIRE (official). Accessed 2026-08-24.

CAL FIRE chimney and stovepipe screen openings. FireApproved. https://fireapproved.com/requirements/cal-fire-chimney-screen/. Last verified 2026-08-24.