31
Category IV Installation of Vent/Air Piping
Category IV - Vent Installation - Sidewall
1. Vent Penetration
-
Vent pipe penetration through combustible or
non-combustible wall material should maintain a
minimum 1/4” [6 mm] clearance for 3” and 4”
PVC/CPVC vents or 1” for 2” PVC/CPVC vents.
The diameter of the penetration hole should be
4” [10.2 cm] minimum for 2” and 3” pipe or 5”
[12.7 cm] minimum for 4” pipe. When using
Polypropylene or Stainless Steel vent, refer to
the vent manufacture’s installation instructions,
supplied with the vent for clearances.
2. The installer must use a galvanized metal thimble for
the vent pipe penetration.
3. Locate the vent pipe penetration to provide minimum
clearances as described in Figs. 26 through 31
pages 30 and 31.
4. The installer must comply with all local codes for iso-
lating the vent pipe as it passes through floors and
walls.
5. The installer should seal all exterior openings
around penetrations with an exterior silicon caulk.
Termination Fittings - Sidewall
1. The vent and combustion air terminations must
include a factory supplied “bird screen” installed as
shown in Figs: 16 through 19 page 21.
2. The combustion air piping must terminate at the boil-
er with a 90
º
elbow.
3. The vent pipe can terminate:
-
Using a 90º elbow as shown in Fig. 29 page 30.
-
Using a coupling as shown in Fig. 26 page 30.
-
Using a tee as shown in Fig. 27 page 30 or Fig. 30
page 31 .
-
Using a 45º elbow as shown in Fig. 28 page 30 or Fig.
31 page 31.
The vent termination must be installed 12” [30.5 cm] min-
imum above grade / highest anticipated snow level.
Do not extend the vent pipe outside the sidewall
beyond the dimensions shown in Figs. 26 through
31 pages 30 and 31. Extended exposure of the vent
pipe could cause condensate to freeze and block the
vent pipe.
WARNING
12
" [3
0.5
cm
] M
in.
A
bo
ve
G
rad
e /
H
igh
es
t
An
tic
ipa
ted
S
no
w
Le
ve
l
12" Min. -
24” Max.
[30.5 cm - 6
1 cm]
To Wall
36" M
ax.
[91.4
cm]
Vent Termination
Category IV - Sidewall Snorkel Termination
of Vent Pipe with 45º Elbow Termination
Fig. 31:
12
" [
30
.5
c
m
] M
in
. A
bo
ve
G
ra
de
/H
ig
he
st
An
tic
ip
at
ed
S
no
w
Le
ve
l
12" Min. -24” M
ax.
[30.5 cm - 61 cm
]
To Wall
36" Ma
x.
[91.4 c
m]
Vent Termination
Category IV - Sidewall Snorkel Termination
of Vent Pipe with Tee Termination
Fig. 30:
Summary of Contents for Prestige CPVC
Page 42: ...Notes...
Page 43: ...Notes...
