Alpine Installation, Operating, and Service Instructions

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IV. Venting B. CPVC/PVC Venting (continued)
Figure 12: Wall Penetration Clearances
for PVC Vent Pipe
Figure 13: Rodent Screen Installation, Horizontal
Vertical, Straight Vent Terminations
• Following the installation of factory supplied near boiler CPVC venting components (30” long pipe
and 90° elbow, where applicable) PVC pipe may be used to penetrate combustible or non-
combustible walls up to the exterior vent termination only if the following three conditions are
met simultaneously (see Figure 12):
1. The wall penetration is 66 in. (1680 mm) or more, measured along the vent from the end of the
CPVC pipe at the boiler vent connection to the wall.
2. The wall is 12 in. (300 mm) thick or less.
3. The minimum air space shown in Figure 12 is maintained around the outside of the vent pipe to
provide air circulation.
If above three conditions cannot be met simultaneously when penetrating a combustible wall, CPVC
pipe must be used for wall penetration up to the exterior vent termination. A PVC vent termination may
be used outside to terminate the CPVC vent.
• Size and cut wall opening such that a minimal clearance is obtained and to allow easy insertion of
vent pipe.
• 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 12).
• Secure trim plate to wall with nails or screws and seal ID and plate OD or perimeter with sealant
material.
• Install rodent screen and vent terminal (supplied with boiler). See Figure 13 for appropriate
configuration details.
NOTICE Methods of securing and sealing terminals to the outside wall must not restrain the
thermal expansion of the vent pipe.
ii. Combustion Air Piping
• Size combustion air pipe wall penetration opening to allow easy insertion of the pipe.
• Install rodent screen and combustion air terminal (supplied with boiler). See Figure 13 for
appropriate configuration details.
• Apply sealant between combustion air pipe and wall opening to provide weather-tight seal.
b. Optional Two-Pipe Snorkel Termination, see Figures 6A and 6B.
This installation will allow a maximum of 7 ft. (2.1 m) vertical exterior run of the vent/combustion air piping
to be installed on the CPVC/PVC horizontal venting application.
NOTICE Exterior run to be included in equivalent vent/combustion air lengths.
i. Vent Piping
• After penetrating wall, install a Schedule 40 PVC 90° elbow so that the elbow leg is in the up
direction.