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3) Assembly of Flex-L-Intl. Star-34 Vent System:
a) Star-34 General Notes:
• Do not cut Star-34 vent components.
• Support horizontal piping sections at intervals of 48” or less.
• Vertical venting systems must be supported by at least one Star-34 Fire stop. An additional vertical support is
required after any offset.
• Orient Star-34 components so that the arrows on the piping labels are in the direction of fl ue gas fl ow.
b) Start assembly of the vent system at the boiler. Remove the hose clamp shipped on the FCM vent collar. Bend the
three hose clamp tabs on this collar outward slightly.
c) Clean the exterior of the male end of the fi rst piece of pipe and the inside of the vent collar on the boiler. Use a
cleaner such as Methyl Ethyl Keytone (MEK) or naptha.
d) On the male end of the pipe, apply a ¼” wide bead of silicone approximately ¼” from the end of the pipe and another
¼” bead against the joint side of the stop bead (Fig 7.17a).
e) Insert the male end of the pipe into the boiler vent collar until it bottoms out.
f) Apply an additional bead of silicone over the outside of the joint and smooth out.
g) Replace and tighten the clamp on the vent collar.
h) Clean the female end of the fi rst piece of pipe. Also clean the male end of the next piece of pipe.
i) Apply silicone as in step (d) (Fig 7.17b).
j) Align the longitudinal seams of the pipe and insert the male end of the second pipe into the female end of the fi rst
pipe.
k) Insert a Star-34 joiner band into the inlet of the beaded channel. Feed the joiner band in so that it makes its way
around the channel and overlaps by approximately ½” (Fig 7.17b).
l) Cut the excess joiner band so that it lays fl at in the beaded channel (Fig 7.17b).
m) Fill the inlet of the beaded channel with silicone. Smooth the silicone over the channel inlet as well as the silicone
between the female end and the stop bead of the male end (Fig 7.17b).
n) Repeat Steps (h) – (m) for the remaining Star-34 components.
p) Allow the silicone to cure per the silicone manufacturer’s instructions before operating the boiler.
Figure 7.17a: Star-34 Connection to Vent Collar
Figure 7.17b: Star-34 Connections