Install Instructions (Venting)
22
2.3 Direct Vent - Vertical Vent and Sidewall
Combustion Air
The installation must conform to the requirements of
the authority having jurisdiction or, in the absence
of such requirements, to the National Fuel Gas
Code, ANSI Z223.1/ NFPA 54, and/or Natural Gas and
Propane Installation Code, CAN/CSA B149.1.
When using an inoperative chimney as a means of a
chase for the vent, the surrounding space within the
chimney cannot be used to draw combustion air or
vent another appliance.
A gas vent extending through a roof should not ter-
minate near an adjacent wall or below any building
extensions such as roof eaves, balconies or decks.
Failure to comply with the required clearances in
this manual could result in severe personal injury,
death or substantial property damage.
NOTICE
NOTICE
WARNING
2
.3.1 Determine Termination Location
L
ocate the vent and combustion air termination using the
following guidelines:
1. The total length of the vent or combustion air piping
must not exceed the limits given in Table 8 on page 10.
Do not include the 90º elbow or coupling used to ter-
minate the combustion air inlet or vent exterior of
the building when determining the total length of
pipe.
2. The combustion air piping must terminate with a 90º
elbow. Fig. 12 shows a snorkel termination option.
The combustion air pipe can also terminate using a
90º elbow directed down as shown in Fig. 6 on page
19. The termination must be installed 12” [30.5 cm]
minimum above grade / highest anticipated snow
level and as shown in Fig. 6 on page 19.
3. The vent must terminate vertically with a coupling to
accept the bird screen and must be located 12” [30.5
cm] (18” [45.7 cm] Canada) above the highest anticipat-
ed snow level.
NOTICE
2.0 Direct Vent Installation of Vent/Air Piping
1
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12" [30.5 cm] Min. Above
Grade / Highest
Anticipated Snow Level
1
2
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(
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Combustion Air
Termination
Vent Termination
Direct Vent - Vertical Vent and Side Wall Combustion Air
Fig. 12: