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These condensing furnaces have been certi-
fied for installation with zero clearance between
vent piping and combustible surfaces. How-
ever, 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 Figure 21. 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 & Propane Instal-
lation code.
All minimum clearances specified must be main-
tained to protect building materials from degra-
dation by flue gases.
Vent and combustion air intake terminations
must be located to ensure proper furnace op-
eration and to conform to applicable codes.
Figure 19 illustrates necessary distances from
the vent termination to windows and building air
intakes. In Canada, the Canadian Fuel Gas
Code takes precedence over these instruc-
tions. Specifically, 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 20 for alternate method
to achieve 12" above snow level.
Mounting Kit
Faceplate Secured
to Wall with Screws
Combustion
Air Inlet
Exhaust Vent
Option C
Figure 21. Exhaust and Combustion Air Pipe Clearances
22
Exhaust Vent
Option B
18" Min.
36" Max.
18" Min.
36" Max.
7" Min.
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. horizon-
tally, 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. installations. In Canada, the Cana-
dian Fuel Gas Code takes precedence.
7.
Avoid areas where condensate drainage
may cause problems by dropping on plant-
ers or patios, etc. Also ensure that exhaust
gases will not impinge on windows or build-
ing surfaces, which may be compromised
or damaged by condensation. Do not install
the vent terminal such that exhaust is
directed into window wells, stairwells, un-
der decks or into alcoves or similar re-
cessed 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.
Exhaust Vent
Option A
8" Min.
18" min.
36" max.
Grade
Level
or Normal
12" Min. to
Snow
Normal Snow Level
Inlet Exhaust
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