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B. For Heat-Fab Saf-T-Vent stainless steel
vent pipe use a high temperature red silicone
sealant rated for 500"F The outside of the
male end and inside of the female end of the
pipe must be cleaned before applying the
silicone bead. For 3" vent pipe runs, the male
end of the vent pipe which goes over the outlet
of the boiler's induced draft blower must be
crimped. The vent pipe should be crimped
as minimal as possible to provide a tight fit
over the outlet. After crimping is completed
follow the instructions for applying silicone
sealant. For 4" vent pipe runs, begin with a
Saf-T-Vent 3" to 4" increaser fitting
(#7374GC) over the boiler's induced draft
blower outlet, to which an even bead of high
temperature silicone sealant should be
applied. Then continue the 4" Saf-T-Vent pipe
run by connecting the 4" male end of the Sal-
T-Vent to the increaser. (A locking band may
be used around this joint for additional
support.) The vent flow must bein the
direction indicated on the vent pipe. When
using the Tjernlund VH-1 vent hood, the female
end (flared end) of the vent pipe will be
connected to the termination hood. Apply high
temperature silicone in an even 1/4" bead
approximately 1/4" to 3/8" from the end of
the vent hood's connecting vent pipe. Also,
run a similar size bead of silicone sealant
down the seam weld of the vent pipe. Then
push the female end over the vent hood's
connecting vent pipe.
1) Apply the high temperature silicone around
the male end of the pipe (without the tabs)
in an even W' bead. Silicone bead should be
approximately 1/4" to 3/8" from the end of
the male end. Also, run a similar size bead
of silicone sealant down the seam weld at
the end of each joint.
2) Pipes can now be pushed together as far as
theywill go. The seams onthe vent pipeshould
be aligned and oriented upward in all
horizontal appliances. With a moistened finger
or fiat tool, spread any sealant that squeezes
out around the circumference of the joint.
3) Attach the sections together with the
locking rings and tabs (except at the blower
outlet where no locking ring exists.)
17
C=
Inspect the joint to ensure that flue gases
will not leak. If necessary apply additional
sealant around the joint.
4) Horizontal venting shall have a slope not
less than 114" (6.4mm) every 12 inches
(305mm) downward away from the boiler
to prevent collection of condensate
throughout the assembly.
5) Allow the sealant to cure for 24 hours
before operating the appliance.
For Flex-L StaR-34 stainless steel vent
pipe use a high temperature red silicone
sealant rated for 500°F. Before applying
silicone, the outside of the male end and
inside of the female end of the pipe must be
cleaned using a cleaner, such as methyl ethyl
ketone (MEK) or naptha. For 3" vent pipe
runs, begin with the male end of the vent pipe
over the boiler's induced draft blower outlet.
For4" vent pipe runs begin with a StaR-34 3"
to 4" increaser fitting (#SR10304) over the
boiler's induced draft blower outlet. For both
3" and 4" vent pipe runs, apply a bead of
silicone sealant around the blower outlet and
around the inside of the male end of vent
pipe going over the blower's outlet. When
using the Tjemlund VH-1 vent hood, the female
end (flared end) of the vent pipe will be
connected to the termination hood. Apply high
temperature silicone in an even %4" bead
approximately 1/4"frem the end of the vent
hood's connecting vent pipe. Also, run a similar
size bead of silicone sealant down the seam
weld of the vent pipe. Then push the female
end over the vent hood's connecting vent pipe.
Now fillin the channel inlet withsilicone sealant.
Do not try to insert the joiner band, instead
fasten the vent pipe to the vent hood's pipe
with a steel gear clamp.
1) Apply the high temperature silicone around
the male end of the pipe in an even 114"
bead. Silicone bead should be approximately
1/4" from the end of the male end. Also, run
a similar size bead of silicone sealant down
the seam weld at the end of each joint.
2) The seams on the vent pipe should be
aligned and oriented upward in all horizontal
vent pipe runs.
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