Spark arrestor

kgerhauser · October 5, 2009, 8:43pm

Removed. Dumb question, varies by individual county.

mboyett · October 5, 2009, 9:09pm

2006 IRC states:

R1003.9.1 Spark arrestors. 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 not be 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 (13 mm) nor block the
passage of spheres having a diameter less than 3/8 inch
(10 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.
This section contains specifications for spark arrestors,
if they are provided. Their use is not mandated by the
code, but owners and builders often install them.