Chapter 28 — MECHANICAL SYSTEMS
2802 Spark Arrestor [sfm] — 2025 California Building Code
California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-09-25 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Building Code (Title 24, Part 2) § 2802 · Effective January 1, 2026 · Official source: Building Standards Commission
2802.1 Spark arrestor. [SFM]¶
All chimneys attached to any appliance or fireplace that burns solid fuel shall be equipped with an approved spark arrester. The spark arrestor shall meet all of the following requirements: 1. The net free area of the spark arrestor shall be not less than four times the net free area of the outlet of the chimney. 2. The spark arrestor screen shall have heat and corrosion resistance equivalent to 19-gage galvanized steel or 24-gage stainless steel.
3. Openings shall not permit the passage of spheres having a diameter larger than 1/2 inch (12.7 mm) nor block the passage of spheres having a diameter of less than 3/8 inch (9.5 mm). 4. The spark arrestor shall be accessible for cleaning and the screen or chimney cap shall be removable to allow for cleaning of the chimney flue.
28-4 2025 CALIFORNIA BUILDING CODE
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