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Where a spark arrestor is installed on a masonry chimney, the spark arrestor shall meet all of the following requirements:
  1. The net free area of the arrestor shall be not less than four times the net free area of the outlet of the chimney flue it serves.
  2. The 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 greater than 1/2 inch (12.7 mm) nor block the passage of spheres having a diameter 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.

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2113.9.2 Masonry, Spark Arrestors
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