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4
Venting
(continued)
Table 4-17: Expansion Loop Lengths
Nominal
Length of
Pipe
Straight Run
ft.
m
Dia. (In.)
20
6.1
30
9.1
3
40
12
50
15
60
18
20
6.1
30
9.1
4
40
12
50
15
60
18
20
6.1
30
9.1
6
40
12
50
15
60
18
• PVC vent pipe may not be used
to penetrate combustible or non-
combustible walls unless all
following three conditions are met
simultaneously (see Figure 4-19):
-
The wall penetration is at least 66
in. (1680 mm) from the boiler as
measured along the vent
-
The wall is 12 in. (300 mm) thick
or less
-
An air space of at least of that
shown in Figure 4-19 is maintained
around outside of the vent pipe to
provide air circulation
• If above three conditions cannot be
met simultaneously when penetrating
a combustible wall, use CPVC pipe
for wall penetration.
• Size and cut wall opening such that
a minimal clearance is obtained and
to allow easy insertion of vent pipe.
24
Loop Length
"L"
in.
mm
53
1350
65
1650
75
1900
84
2130
92
2340
60
1520
74
1880
85
2159
Figure 4-18: CPVC/PVC Expansion Loop and Offset
95
2413
104
2642
73
1850
90
2290
103
2620
116
2950
127
3230
APEX
Installation, Operating, & Service Instructions
Figure 4-19: Wall Penetration Clearances
for PVC Vent Pipe
Wall thimbles for CPVC/PVC pipe
are available from Thermal Solutions:
P/N's 102180-01 (3 in.), 102181-01 (4
in.), 103419-01(6 in.).
• Apply sealant between vent pipe and
wall opening to provide weather-tight
seal. Sealant should not restrain the
expansion of the vent pipe.
• Install contractor provided optional
trim plate on wall outside surface to
cover wall opening (see Figure 4-19).
• Secure trim plate to wall with nails or
screws and seal ID and plate OD or
perimeter with sealant material.
106308-05 - 3/23
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