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c) For single wall pipe through non-combustible
walls, the hole through the wall need only be
large enough to maintain the pitch of the vent
pipe, and provide proper sealing. A thimble is
not required for single wall pipe passing
through noncombustible walls.
d) The venting system shall terminate at least 3
feet above any forced air inlet located within
10 feet. The venting system shall terminate
at least 4 feet below, 4 feet horizontally from,
or 1 foot above any door, window, or gravity
air inlet into any building. The bottom of the
vent shall be located at least 12 inches above
grade. Termination of the vent shall be not
less than 7 feet above an adjacent public
walkway. The vent terminal shall not be
installed closer than 3 feet from the inside
corner of an L shaped structure. Termination
of the vent should be kept at least 3 feet away
from vegetation. The venting system shall
terminate at least 4 feet horizontally from, and
in no case above or below, unless a 4 foot
horizontal distance is maintained, from electric
meters, gas meters, regulators, and relief
equipment,
e) The venting system shall terminate at least 4
feet below any eave, soffit, or roof overhang.
f) The venting system shall not terminate
underneath any deck, patio, or similar
structure.
g) Put vent on a wall away from the prevailing
winter wind. Locate or guard the vent to prevent
accidental contact with people or pets.
h) Terminate the vent above normal snowline.
Avoid locations where snow may drift and block
the vent. Ice or snow may cause the boiler to
shut down if the vent becomes obstructed.
i) Under certain conditions, flue gas will condense,
forming moisture. In such cases, steps should
be taken to prevent building materials at the
vent terminal from being damaged by exhaust
of flue gas.
8. Joining and Sealing the Vent Pipe:
The vent pipe needs to be both watertight and
gastight. Seal a!l joints and seams as follows:
A. For Z-Flex Z-Vent stainless steel vent pipe
use a high temperature red silicone sealant rated
for 500°F. The outside ofthe male end and inside
ofthe female end ofthe pipe must be cleaned with
brake cleaner before applying silicone bead,
16
For 3"vent pipe runs begin with the male end of
the vent pipe over the boilers induced draft
blower outlet. For 4" vent pipe runs begin with a
6" length of 3" Z-Vent (#02SVEPxx0306) over
the boiler's induced draft blower outlet, to which
an even bead of high temperature silicone sealant
should be applied. Then connect the 3" Z-Vent
to a Z-Vent 3" to 4" reducer (#02SVERxx0403).
Then continue the 4" Z-Vent pipe run by
connecting the 4" male end of the Z-Vent to the
reducer. (A locking band may be used around
this joint for additional support.) Then following
the sealing instructions, push the 4" male end of
the Z-Vent over the 4" increaser fitting. When
using the Tjernlund VH-1 vent hood, the female
end (flared end) of the vent pipe will be
connected to the termination hood. The male
end of the vent hood must be crimped before
pushing the Z-Vent over the vent hood's
connecting pipe. Before the pipes are joined,
apply a 1/4" bead of silicone one inch from the
end of themale end. Then push the pipes
together as far as they will go making sure any
seams are aligned and oriented upward. Now
apply another bead of silicone around this joint
and smooth out. Then use a Z-Flex locking band
around the center of the joint.
Z-Flex Z-Vent Size Lockina Band Part #
3" #02SVSLBX03
4" #02SVSLBX04
1) Apply the high temperature silicone
approximately one inch from the end, around
the male end of the pipe in an even 1t4" bead.
2) Pipes can now be pushed together as far
as they will go. The seams on pipe should
be aligned and oriented upward in all
horizontal appliances. Apply another bead
of silicone around this joint and smooth
out.3) Slide locking band over center ofjoint
and tighten gear clamps. Make sure locking
band is centered on joint.
4) Check alljoints and seams for gas tightness.
5) Horizontal venting shall have a slope not
less than 1/4" (6.4mm) every 12 inches
(305mm) downward away from the boiler
to prevent collection of condensate
throughout the assembly.
6)Allow the sealant to cure for 24 hours before
operating the appliance.
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