Install Instructions (Venting)

27
3.0 Category IV Installation of Vent/Air Piping
3
.1.4 Category IV - Multiple Boiler Installation -
Through the Roof
1. On installations of multiple PRESTIGE boilers, termi-
nate each vent pipe as described in this manual.
2. Each vent termination must be a minimum 12” [30.5
cm] from the adjacent termination for installations in
the U.S. as shown in Fig. 16. For installations in
Canada, provide clearances as required by
CAN/CSA B149.1.
3.2 Category IV - 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
pages 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.
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.
3.2.1 Determine Termination Location
Locate the vent and combustion air termination using the
following guidelines:
1. The combustion air must terminate at the boiler with
a 90º elbow.
2. The total length of the vent must not exceed the limits
given in Table 8 on page 10.
DO NOT include the 90º elbow used to terminate the
vent exterior of the building when determining the
total length of pipe.
NOTICE
NOTICE
WARNING
NOTICE
NOTICE
Vent Termination
1
2
"
[
3
0
.
5
c
m
]
(
1
8
”
[
4
5
.
7
c
m
]
C
a
n
a
d
a
)
A
b
o
v
e
t
h
e
H
i
g
h
e
s
t
A
n
t
i
c
i
p
a
t
e
d
S
n
o
w
L
e
v
e
l
1
2
"
M
i
n
.
[
3
0
.
5
c
m
]
Category IV- Vertical Vent Termination of
Multiple Boilers
Fig. 16: