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2802 Spark Arrestor
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- 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.
- The spark arrestor screen shall have heat and corrosion resistance equivalent to 19-gage galvanized steel or 24-gage stainless steel.
- 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).
- 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.