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4
Venting
(continued)
i. Vent Termination
• Use components listed in Table 4-30,
4-31 or 4-32.
NOTICE: The joint between the terminal and the
last piece of pipe must be outside of the building.
• Male end of terminal will fit into
female end of any of the listed
stainless vent systems.
• Apply a heavy bead of silicone to
the male end of the terminal before
inserting it into the last piece of pipe.
Orient the terminal so that the seam
in the terminal is at 12:00.
• Smooth the silicone over the seam
between the terminal and the last
piece of pipe, applying additional
silicone if necessary to ensure a tight
seal.
• Allow the silicone to cure per the
silicone manufacturer's instructions
before operating the boiler.
ii.
Combustion Air Termination
• Use a 90° elbow directed downward.
• Install a screen in the inlet terminal.
Use a screen having 1/2 in. x 1/2 in.
(13 mm x 13 mm) mesh.
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
approved AL29-4C stainless steel horizontal
venting application.
i.
Vent Termination
• After penetrating wall, install the
appropriate manufacturer's 90°
elbow so that the elbow leg is in the
up direction.
• Install maximum vertical run of 7 ft.
(2.1 m) of appropriate
manufacturer's vent pipe as shown in
Figure 4-7.
• At top of vent pipe length install
another appropriate manufacturer's
90° elbow so that the elbow leg
is opposite the building's exterior
surface.
• Install horizontal vent terminal.
• Brace exterior piping if required.
34
APEX
Installation, Operating, & Service Instructions
ii.
Combustion Air Termination
• After penetrating wall, install a 90°
elbow so that the elbow leg is in the
up direction.
• Install maximum vertical run of 7 ft.
(2.1 m) of combustion air pipe as
shown in Figure 4-7.
• At top of vent pipe length install
another 90° elbow so that the elbow
leg is opposite the building's exterior
surface.
• Install screen and horizontal vent
terminal.
• Brace exterior piping if required.
5. Vertical Vent Termination
a. Standard Two-Pipe Termination
See Figures 4-9 and 4-10.
i.
Vent Termination
• Use the terminal supplied by the
vent system manufacturer shown
in Table 4-30, 4-31 or 4-32. Follow
manufacturer's instructions to attach
terminal to vent system.
ii.
Combustion Air Termination
• Install vertical combustion air
terminal. Vertical combustion air
terminal consists of a 180° bend
(comprised of two 90° elbows) as
shown in Figure 4-9.
• Install screen in the combustion air
terminal. Use a screen having 1/2 in.
x 1/2 in. (13 mm x 13 mm) or larger
mesh.
E. Optional Room Air for Combustion
1. General Guidelines
a. Room air is optional for commercial
applications. Room air uses one pipe to
expel products of combustion directly
outdoors with combustion air supplied from
boiler room or enclosure. Direct vent is
recommended for residential applications.
Direct vent uses two pipes, one to expel
products of combustion directly outdoors
and one to supply combustion air to the
boiler directly from outdoors. See preceding
sections A through D for direct vent
instructions.
b. Avoid combustion air contaminants in the
boiler room. See Table 3-1. Permanently
remove any contaminants found in the boiler
room. If contaminants cannot be removed,
do not use room air for combustion.
106308-05 - 3/23
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