Install Instructions

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IV. Venting D. Stainless Steel Venting (continued)
WARNING
Asphyxiation Hazard. Vent systems made by Heat Fab, M&G / DuraVent and Z-Flex rely on gaskets for
proper sealing. When these vent systems are used, take the following precautions:
• Make sure that gasket is in position and undamaged in the female end of the pipe.
• Make sure that both the male and female pipes are free of damage prior to assembly.
• Only cut vent pipe as permitted by the vent manufacturer in accordance with their Instructions. When
pipe is cut, cut end must be square and carefully de-burred prior to
assembly.
a. Plan venting system to avoid possible contact
with plumbing or electrical wires. Start at
vent connector at boiler and work towards vent
termination.
b. Follow all manufacturer instructions and
warnings when preparing pipe ends for joining
and when assembling the vent/combustion air
system.
c. On horizontal pipe sections, orient all welded
seams at the 12:00 position. Do not place
longitudinal welded seams at the bottom of
horizontal sections of vent pipe.
d. Assemble the combustion air system using either
galvanized or PVC pipe.
i. If PVC piping is used, use PVC cement
to assemble the PVC intake system
components. See “B. CPVC/PVC Venting”
for combustion air pipe installation
instructions.
ii. If galvanized piping is used, use at least two
sheet metal screws per joint. Seal outside of
all joints
5. Horizontal Sidewall Vent Termination
a. Standard Two-Pipe Termination
See Figure 5.
i. Vent Termination
• Use a stainless steel coupling the
horizontal position.
NOTICE
The joint between the terminal and the last piece
of pipe must be outside of the building.
4. System Assembly
NOTICE
The venting system must be free to expand and contract and supported in accordance with installation
instructions included by the original stainless steel venting component manufacturers, Heat Fab, M&G /
DuraVent or Z-Flex, whichever applicable.
• Male end of terminal will t 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 an elbow in the downright position.
Elbow should protrude the same distance
from the wall as the exhaust terminal as
shown in Figure 5.
• Install a rodent screen (not supplied) 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 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
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 6A.