18
Straight neoprene couplings are supplied with
the downfl ow furnaces only. These couplings
are to be installed in the combustion air inlet (if
present) and exhaust vent piping at the furnace
as shown in Figure 11. For an upfl ow furnace
installation, if breakable connections are required
in the combustion air inlet (if present) and exhaust
vent piping, then straight neoprene couplings for
3” piping with hose clamps can be used. These
couplings can be ordered through your local
furnace distributor.
To install a coupling, slide the rubber coupling
over the end of the pipe that is attached to the
furnace and secure it with one of the hose
clamps. Then slide the other end of the rubber
coupling onto the other pipe from the vent and
secure the coupling with the second hose clamp.
For the upfl ow models, the combustion air pipe
can be attached to the furnace. Ensure that the
connection is tight and leak free.
These condensing furnaces have been certifi ed
for installation with zero clearance between vent
piping and combustible surfaces. However, it is
good practice to allow space for convenience in
installation and service.
Location of Outdoor Terminations
Horizontal Venting
Vent and combustion air intake terminations
must be as shown in Figures13 and 14. Vent
termination clearances shall be consistent with
the National Fuel Gas Code, ANSI Z223.1/NFPA
54 and/or the CSA B149.1, Natural Gas & Pro-
pane Installation code.
All minimum clearances specifi ed must be
maintained to protect building materials from
degradation by fl ue gases.
Vent and combustion air intake terminations must
be located to ensure proper furnace operation and
to conform to applicable codes. Figures 13 and
14 illustrate necessary distances from the vent
termination to windows and building air intakes.
In Canada, the Canadian Fuel Gas Code takes
precedence over these instructions. Specifi -
cally, all minimum distance requirements with
respect to termination of the vent piping listed
below (items 1 through 8).
The following list is a summary of vent terminal
location requirements:
1. The termination must be 12 inches above
snow level or grade level whichever is
higher. See Figure 15 for alternate method
to achieve 12” above snow level.
2. The minimum distance for a (1-pipe instal-
lation) from any door, (openable) window, or
gravity air inlet is 4 ft. below, 4 ft. horizontally,
or 1 ft. above.
3. The minimum distance for a direct vent (2-
pipe installation) from any door, (openable)
window, or air gravity inlet is 1 ft. below, 1 ft.
horizontally, or 1 ft. above.
4. For one-pipe installations the recommended
minimum distance from an inside corner
formed by two exterior walls is 6 feet, but is
not required.
5. The vent termination for a 1-pipe installation
shall be a minimum of 3 ft. above any forced
air inlet within 10 ft.
6. The vent termination shall be located at least
4 ft. horizontally from any electric meter, gas
meter, regulator and any relief equipment.
These distances apply ONLY to U.S. instal-
lations. In Canada, the Canadian Fuel Gas
Code takes precedence.
7.
Avoid areas where condensate drainage may
cause problems by dropping on planters or
patios, etc. Also ensure that exhaust gases
will not impinge on windows or building
surfaces, which may be compromised or
damaged by condensation. Do not install the
vent terminal such that exhaust is directed
into window wells, stairwells, under decks
or into alcoves or similar recessed areas,
and do not terminate above any public
walkways.
8. Select the point of wall penetration where
the minimum 1/4 inch per foot of slope up
can be maintained.
Figure 15. Alternate Horizontal Vent Installation
Outside
Wall
Support
Vent Configuration to
Provide 12" Minimum
height above
Snow Level.
1/2"
Armaflex
Insulation or
Equivalent
(if required)
12" Above
Normally
Expected
Snow
Level
12" Min.
19" Max.
