Burnham ALPINE - Page 26

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use is optional for non-combustible wall.
Insert thimble from wall from outside.
Secure outside ange to wall with nails
or screws, and seal ID, OD and vent
holes with sealant material. Install inside
ange to inside wall, secure with nails or
screws, and seal with sealant material.
• For noncombustible wall application
when thimble is not used, size opening
such that a minimal clearance is
obtained.
See Figure 7.
• Install Rodent Screen and Vent Terminal
(supplied with boiler), see Figure 9 for
appropriate conguration.
• Apply sealant between vent pipe and
opening/thimble to provide weather-tight
seal. Sealant should not restrain the
expansion of the vent pipe.
Figure 9: Rodent Screen Installation
Figure 8 : Direct Vent - Sidewall Terminations
ii. Combustion Air Piping
•
Do not exceed maximum combustion air
length. Refer to Table 7.
• Size combustion air wall penetration to
allow easy insertion of combustion air
piping.
• Install Rodent Screen and Combustion
Air Terminal (supplied with boiler), see
Figure 9 for appropriate conguration.
• Apply sealant between vent pipe and
opening to provide weather
-tight seal.
b. Optional
Two-Pipe Snorkel Termination
Refer to Figures 7, 9 and 10.
This installation will allow a maximum of
seven (7) feet 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.
• Install maximum vertical run of seven (7)
feet of Schedule 40 PVC vent pipe. See
Figure 10.
• At top of vent pipe length install another
PVC 90° elbow so that elbow leg is
opposite the building’s exterior surface.
• Install Rodent Screen and Vent Terminal
(supplied with boiler), see Figure 9 for
appropriate conguration.
• Brace exterior piping if required.
ii. Combustion Air Piping
• After penetrating wall, install a Schedule
40 PVC 90
o
elbow so that elbow leg is in
the up direction.
IV. Venting (continued)