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Theventing tablesinthismanual wereextracted f romthe
National FuelGasCode (ANSI Z 223.1/NFPA 54)andare
provided a s a guide forproper v entinstallation. Proper a p-
plication, t ermination, construction a ndlocation of vents
mustconform to local c odes having jurisdiction. Intheab-
sence
d local codes, the NFGC serves as the defining doc-
ument,
Refer to the tables and the venting information contained in
these instructions to properly size and install the venting
system.
klMPORTANT
&WARNING
VENT CONNECTION
FLUE TRANSITION
COLLAR
VENT
PIPE
FURNACE
FIGURE 10
Use self-drilling sheet metal screws or a mechanical fas-
tener to firmly secure the vent pipe to the round collar of the
flue transition. If self-drilling screws are used to attach the
vent pipe, it is recommended that three be used. Drive one
self-drilling screw through the front and one through each
side of the vent pipe and collar, See figure 10.
Install the first vent connector elbow at a minimum of six
inches (152 mm) from the furnace vent outlet,
Venting Using a Masonry Chimney
The following additional requirements apply when a lined
masonry chimney is used to vent this furnace.
Masonry chimneys used to vent Category I central fur-
naces must be either tile-lined or lined with a listed metal
lining system or dedicated gas vent, Unlined masonry
chimneys are prohibited, See figures 11 and 12 for com-
mon venting.
A chimney with one or more sides exposed to the outside of
the structure is considered to be an exterior chimney.
An exterior masonry chimney that is not tile-lined must be
lined with B1 vent or a listed insulated flexible metal vent.
An exterior tile-lined chimney that is sealed and capped
may be lined with a listed uninsulated flexible metal vent,
If the existing chimney will not accommodate a B1 vent or
an insulated flexible vent pipe liner, either the chimney
must be rebuilt to accommodate
one of these liners or an
alternate approved venting method must be found.
Insulation for the flexible vent pipe must be an encapsu-
lated fiberglass sleeve recommended
by the flexible vent
pipe manufacturer. See figure 11.
DO NOT insulate the space between the liner and the
chimney wall with puffed mica or any other loose gran-
ular insulating material
A fan-assisted furnace may be commonly vented into an
existing lined masonry chimney if the following conditions
are met:
• The chimney is currently serving at least one drafthood
equipped appliance
• The vent connectors and chimney are sized according
to the provided venting tables for the USA, and the ap-
propriate venting tables in the standards of CSA B149
Natural Gas and Propane Installation Code in Canada
Common Venting Using Metal-Lined Masonry Chimney
T
MAX. LENGTH
* SEE NOTE 1
BELOW.
2VE%O%%OTOR
"
SEALED
J
II
II
EXTERIOR
CHIMNEY
WITH
II
METALUNEB
II
'1
__
.J
PERMANENTLY
SEALED
FIREPLACE
OPENING
NOTE 1 - Refer to the provided
venting
tables for iostallations
in the USA
and the venting tables in CSA-B149 for installations
Canada.
NOTE 2 - Either single-walled
or double-walled
vent connector
may be
used. Refer to the capacity requirements
shown
in the provided
venting
tables for installations
in USA and the venting tables in current
CSA-
B149 for installations
in Canada.
FIGURE 11
Page 11
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