UL103HT
According to the Simpson DuraTech installation guide,
DuraVent has been approved for use with solid fuel
appliances, including wood stoves, fireplaces, fireboxes,
furnaces, water heaters, stoves, ranges, and other
residential types appliances using gas, coal or wood,
according to UL103HT. The system specifies a clearance
of at least 2” between the DuraTech chimney system and
any combustible materials, and a height of 3” above the
roof, and 2” above any roof within 10’.”
6.3. Simpson DuraTech chimney system.
Chimney Height and Size
For outdoor installation, flue length depends on such local
conditions as prevailing wind, height of chimney, proximity
of taller, nearby structures, etc. A good rule of thumb is to
choose a flue that has an area of about 3-4 times the door
height. Depending on what is nearby, you may need a
taller chimney. One option is to test your oven after it has
cured with a single section of chimney pipe to see how
well it draws. If it is not enough, you can add another
section to extend it
Spark Arrestor/Chimney Caps
Use a spark arrestor chimney cap. It uses heavy gauge
steel and is similar in style to a window screen. Its purpose
is to trap burning embers that may float up the chimney
and stop them there. Once the fuel of the ember has been
used, its temperature will decrease and the by-product will
be a small amount of ash. A chimney cap will also keep
rain from pouring down the flue. There are many styles,
ranging from a plain metal arrangement, to whimsical
ceramic gargoyles.
The Simpson DuraTech chimney system contains a UL-
approved chimney cap.
6.4. Simpson Spark Arrestor.
ASTM 1283 (Standard Practice for Installing Clay
Flue Lining):
Flue liners shall be surrounded by masonry on all sides
but shall not be bonded to the surrounding masonry. The
flue liner shall contact the chimney wall only as necessary
for support and alignment in order to permit the flue liner
to expand and contract freely.
Casa Installation and Operating Manual
© Forno Bravo, LLC 2008/9. All Rights Served.
Ver. 2.1
28
