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The airflow through the system and
out the chimney means that oxygen
is leaving the home and will create
an oxygen deficit if this air is not
replaced.
Masonry Chimneys
If you plan on using a preexisting masonry
chimney, have it thoroughly inspected and cleaned.
Any faults which make the chimney unsafe and
unusable must be repaired prior to use.
include improper height, structural defects,
blockages, inadequate clearance to combustibles,
unsealed openings into other rooms of the house,
signs of creosote or smoke leakage, a loose or absent
clean-out door, or absence of a liner.
When connecting to a masonry chimney, several
provisions are standard. First, whether the chimney
connector is vented to the chimney through a
thimble or a breech pipe, neither must pass beyond
the inner surface of the chimney liner, and both
must be 9rmly cemented in place with refractory
cement. (A thimble is a masonry pipe which is
inserted through the chimney wall, and is frequently
the preferred method; a breech pipe is a piece of
steel pipe used the same way.) In Canada, a breech
pipe has ridges or protrusions to lock it 9rmly into
the refractory cement. In either case, the chimney
connector vents to the chimney through the thimble
or breech pipe. See wall pass-through information in
the section on stove pipe.
Prefabricated Chimneys
When venting your boiler using a prefabricated
chimney, be sure to contact local building code
authorities, and to follow the manufacturer's
instructions exactly. Use only the manufacturer's
parts; do not use makeshi; installation techniques.
All prefabricated chimneys must be tested to either
the U.S. or Canadian high-temperature standards,
UL 103 or ULC-629.
Your manufactured chimney may contain more
parts than is shown in the subsequent diagrams.
Include all required items in your installation. A
chimney cap (A) serves to keep rain and snow from
entering the chimney. An approved Class A chimney
(B) is required for the SF170 and SF270 boilers. Wall
Bands (C) must be deployed for support per
manufacturer's recommendations. A manufacturer's
Wall Support Kit (D) will contain required items for
supporting the chimney. Such kits will cost less than
individual items purchased separately. A Bo=om
Cap (E, location marked, but actual cap not shown)
allows for cleaning. A Finishing Collar (F) provides
inside wall protection. A Wall
for required clearance between the chimney pipe
passing through a Eammable wall.
ese can
Connector (H) must be approved single wall, or a
low clearance pipe, installed with required
clearances in place. A Roof Brace (I) is required for
chimneys that extend more than a certain distance,
as referenced by the manufacturer's instructions,
from the roof. Manufactured chimneys may feature
a built in "twist lock" at each joint, but a Joint Band
(J) is still normally required to secure pipe at the
joint. An approved Chimney Pipe Adapter (K) is
required. A Ceiling Support (L) will provide
structural support for the chimney and is typically
part of a kit that includes items that maintain
required clearances to Eammables. A Storm Collar
(M), and Adjustable Flashing (N) prevent water from
entering the home by running down the outside of
the chimney. Additional items or a kit (O) provide
additional mounting support or 9re protection to the
roof joists or other roof components.
- 4 -
imble (G) provides
e Chimney
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