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5) Assembly of Z-Flex Z-Vent III:
a) General Notes:
• Non-expanded ends of SVE Series III piping sections may be cut using aviation snips or a 24 thread per inch hacksaw.
File or sand the cut end smooth before assembling. Expanded ends may be cut to adapt the SVE series III to the vent
collar or Crown coaxial terminal. See the following instructions.
• Support horizontal piping sections at intervals of 48” or less.
• Vertical venting systems must be supported by at least one Z-Flex fi re stop. An additional vertical support is required after
any offset and as required by the Z-Vent III installation instructions.
b) Start assembly of the vent system at the boiler. Remove the hose clamp shipped on the CWD 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. Remove dirt,
grease, and moisture from the surfaces to be sealed. Dry surfaces or allow to dry thoroughly.
d) On the male end of the pipe, apply a ¼” wide bead of high temperature silicone approximately ½ inch from the male end
of the pipe. Apply ¼” beads of silicone along both sides of the longitudinal seam (Fig. 20).
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. Also apply silicone over the seams in
the collar (Fig 20).
g) Replace and tighten the clamp on the vent collar.
h) The female end of each Z-Vent III component has a silicone sealing gasket. Examine all vent components to insure that
the gasket integrity has remained during shipping. Gaskets must be in the proper position or fl ue gas could leak resulting
in carbon monoxide poisoning.
i) Align the second piece of pipe with the fi rst and push them together as far as they will go, but not less than 1 3/4”.
j) Tighten gear clamp to a minimum torque of 40 in-lbs and a maximum of 50 in-lbs.
k) Repeat Steps (h) – (j) for the remaining Z-Vent III components. If a termination elbow is used, use this procedure to
complete the vent system.
l) If a termination elbow or tee is used, a locking band or gear clamp must be used at either side of the wall penetration to
prevent shifting of the vent system in and out of the wall. This applies to both combustible and non-combustible walls.
m) To join Z-Vent III to a Crown coaxial terminal, a male end must be present at the end of the piping to be joined to the
terminal. It will therefore be necessary to cut off the expanded end of the pipe before it can be joined to the terminal.
This male end of the pipe must be inserted into the terminal connection with at least a 1” overlap. It may be necessary to
crimp the end of the vent pipe before it can be inserted into the terminal. Apply silicone to the male end of the pipe as in
(d) above, insert into the terminal, and apply an additional bead of silicone over the outside of the joint. Smooth out the
excess silicone and tighten the hose clamp on the terminal.
n) Allow the silicone to cure per the silicone manufacturer’s instructions before operating the boiler.
FIGURE 20: Z-VENT III CONNECTION TO VENT COLLAR