Install Instructions (Venting)

17
2.0 Direct Vent Installation of Vent/Air Piping
DO NOT include the 90º elbows used to terminate
t
he combustion air inlet and vent exterior of the
building when determining the total length of pipe.
2. The combustion air pipe must terminate using a 90º
elbow directed away from the vent termination. The
combustion air termination must be installed 12” [30.5
cm] minimum above grade / highest anticipated snow
level and as shown in Figs. 6 through 8 on page 19.
The combustion air termination can be placed on
either side of the vent termination. The vent and
combustion air terminations must be a minimum 12”
[30.5 cm] apart. The vent and combustion air termi-
nations are not required to be in the same pressure
zone. The combustion air termination must be
directed away from the vent see Fig. 8 on page 19.
The combustion air termination must be directed
down for Figs. 6 and 7 on page 19.
3. The vent pipe can terminate:
- Using a 90º elbow as shown in Figs. 6 or 8 on page 19.
- Using coupling as shown in Fig. 7 on page 19.The
vent termination must be installed 12” [30.5 cm]
minimum above grade / highest anticipated snow
level.
Do not extend the vent pipe outside the sidewall
beyond the dimensions shown in Figs. 6 through 8.
Extended exposure of the vent pipe could cause
condensate to freeze and block the vent pipe.
4. The combustion air and vent pipe center lines must
be a minimum of 12” [30.5 cm] apart as shown in
Figs. 6 through 8 on page 19.
5. The following should be considered when determin-
ing the location of the vent and combustion air ter-
mination:
a. Locate the vent termination where flue vapors
will not damage surrounding shrubs, plants, air
conditioning equipment or be objectionable to
the homeowner.
b. The flue products will form a noticeable plume
of water vapor as they condense in colder air.
Avoid terminating the vent in areas where the
plume could obstruct window views.
NOTICE
NOTICE
WARNING
2.2 Direct Vent - Horizontal - Sidewall
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.
For direct vent (sidewall) installations in the
Commonwealth of Massachusetts, the installer must
comply with the additional requirements outlined on
page 37 and 38.
A gas vent extending through a sidewall should not
terminate near an adjacent wall or below any build-
ing extensions such as roof eaves, balconies or
decks. Failure to comply with the required clear-
ances in this manual could result in severe personal
injury, death or substantial property damage.
To reduce the potential of the combustion air inlet
freezing up it is recommended to separate the vent
and air terminations in both a horizontal and vertical
plain as shown in figures 6 through 8 on page 19.
The information and diagrams outlining the fittings
and method of terminating the vent/combustion air
are directly related to PVC/CPVC vent systems.
When utilizing and AL29-4C® or Polypropylene vent
system there may be some variations. Consult the
appropriate vent manufacturer for recommenda-
tions and clarifications.
2.2.1 Determine Termination Location
Locate 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.
NOTICE
NOTICE
WARNING
BEST PRACTICE
NOTICE