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6. The furnace shall be connected to a factory-built
chimney or vent complying with a recognized stan-
dard, or a masonry or concrete chimney lined with a
lining material acceptable to the authority with jurisdic-
tion. Venting into an unlined chimney or a single
wall metal vent is prohibited in all cases. A lined
chimney may be used if a draft hood equipped
appliance, such as a water heater, is connected to
the same flue (see Figures 8 and 9).
7. Extend the vent connector into the chimney so that it
is flush with the inside of the flue liner. Seal the joint
between the pipe and the liner.
8. Masonry chimneys serving fireplaces cannot be used
for venting purposes unless the fireplace opening is
permanently sealed.
9. A vent connector serving this appliance must not be
connected into any portion of mechanical draft sys-
tems operating under positive pressure.
10. The vent pipe must not be connected to a chimney
flue serving a solid fuel appliance.
11. A manual damper, barometric draft regulator, or flue
restrictor must not be installed between the furnace
and the chimney.
12. Where local experience indicates that condensate may
be a problem, the vent shall be constructed to prevent
condensation from entering the combustion blower.
Provision shall be made to drain off the condensate
(see Figures 8 and 9).
13. All unused chimney openings should be closed.
14. All vent pipe run through unconditioned areas or
outside shall be constructed of factory-built chimney
sections (see Figure 8).
15. Multistory venting is allowed as permitted by the
National Fuel Gas Code or local codes.
16. Install all vents in accordance with the vent
manufacturer’s instructions. For unlisted material,
install in accordance with the National Fuel Gas Code.
17. Vent terminals must be installed in accordance with
the vent terminals listing or in accordance with the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 (latest
edition) or the CSA B149.1, Natural Gas and Propane
Installation Codes, and local codes.
Sidewall Venting
This furnace can be sidewall (horizontally) vented with a
listed sidewall venter, such as Field Controls Model SWG-
4HD with CK-43 Control Kit, or Tjernlund Model GPAK-JT.
Category I venting classification is maintained when vented
in this manner. The furnace, power venter, and control kit
(where applicable) must be installed in accordance with their
installation instructions and all applicable codes.
The following limitations also apply to the two previously
mentioned venters.
Vent pipe diameter: 4"
Minimum vent pipe length: 4'
Maximum vent pipe length: 25'*
Maximum number of 90° elbows: 4
* When fewer than four elbows are used, maximum vent
pipe length can be increased by 5' per unused elbow.
Liner
Masonry
Chimney
Cleanout
Masonry Chimney Venting
Figure 9
Factory-Built
Chimney
Cleanout
Factory-Built Chimney Venting
Figure 8
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