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4
Venting
(continued)
Figure 4-20: Screen Installation
• Install screen and vent terminal
(supplied with boiler). See Figure
4-20 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 screen and combustion air
terminal (supplied with boiler).
See Figure 4-20 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 Figure 4-7.
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.
• Install maximum vertical run of 7 ft.
(2.1 m) of Schedule 40 PVC vent
pipe. See Figure 4-8.
• At top of vent pipe length install
another PVC 90° elbow so that elbow
leg is opposite the building's exterior
surface.
• Install screen and vent terminal
(supplied with boiler), see Figure
4-20 for appropriate configuration.
• Brace exterior piping if required.
106308-05 - 3/23
APEX
Installation, Operating, & Service Instructions
ii.
Combustion Air Piping
• After penetrating wall, install a
Schedule 40 PVC 90° elbow so that
elbow leg is in the up direction.
• Install maximum vertical run of 7 ft.
(2.1 m) of Schedule 40 PVC vent
pipe. See Figure 4-7.
• At top of air pipe length install
another PVC 90° elbow so that elbow
leg is opposite the building's exterior
surface.
• Install screen and combustion air
terminal (supplied with boiler).
See Figure 4-20 for appropriate
configuration.
• Brace exterior piping if required.
6. Vertical Roof Termination
a. Standard Two-Pipe Termination
See Figures 4-9 and 4-10.
i.
Vent Piping
• Install fire stops where vent passes
through floors, ceilings or framed
walls. The fire stop must close the
opening between the vent pipe and
the structure.
• Whenever possible, install vent
straight through the roof. Refer to
Figures 4-9 and 4-10.
-
Size roof opening to maintain
minimum clearance of 1 in. (25
mm) from combustible materials.
-
Extend vent pipe to maintain
minimum vertical and horizontal
distance of 12 in. (300 mm) from
roof surface. Allow additional
vertical distance for expected
snow accumulation. Provide
brace as required.
NOTICE: Vertical venting and combustion air
roof penetrations (where applicable) require the
use of roof flashing and storm collar, which are
not supplied with boiler, to prevent moisture from
entering the structure.
-
Install storm collar on vent pipe
immediately above flashing.
Apply Dow Corning Silastic
732 RTV Sealant or equivalent
between vent pipe and storm
collar to provide weather-tight
seal.
• Install screen and vent terminal
(supplied with boiler). See Figure
4-20 for appropriate configuration.
• Brace exterior piping if required.
25
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