DuraVent DuraStack Installation - Manual (Page 24)

NOTE:.DIAGRAMS.&.ILLUSTRATIONS.ARE.NOT.TO.SCALE.
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VARIABLE LENGTH
1.. .The.variable.length.(LV).is.used.only.to.make.odd.lengths,.it.doesn’t.
compensate.thermal.expansion..See.figure 65 for typical location.
2.. .The.variable.length.assembly.includes.a.sliding.flanged.female.cou-
pling,.a.flanged.retaining.band,.a.locking.band,.a.insulation.band.and.
split.outer.casing...Inner.flue.sealant.S-2000.or.S-650.is.necessary.
depending.on.the.flue.gas.temperature.
3.. .Installation steps :
a..Measure.the.distance.required.for.the.variable.length...See figure
59.
b..Cut.the.inner.wall.at.the.dimension.found.at.point.‘a.’.plus.1”...
Cut.the.split.outer.casing.at.dimension.plus.5/8”...Then.cut.the.
insulation.band.at.dimension.(DIS.only)...See.figure 60.
c..Install.the.interior.assembly.between.the.two.parts...Put.one.
bead.of.sealant.between.the.couplings.flanges.as.a.regular.length.
installation...See.figure 61.
d..Slide.down.the.female.coupling.over.the.male.coupling.of.down-
stream.part.and.fill.the.gap.between.the.female.coupling.and.the.
inner.wall.with.S-2000.or.S-650.sealant...See.figure 62.
e..Slide.down.the.retaining.band.to.the.female.coupling.to.mate.
their.flanges.and.tighten.the.band...Then,.install.the.locking.band.
over.those.flanges..See.figure 63.
f.. Install.the.insulation.over.the.inner.wall.(DIS.only)...See figure
64.
Figure 59- Variable length, Installation step A
Figure 60 - Variable length, Installation step B
Figure 64 - Variable length, Installation step F
Figure 65 - Variable length, Installation step G Figure 61 - Variable length, Installation step C
Figure 62 - Variable length, Installation step D
Figure 63 - Variable length, Installation step E
Slide down the female coupling
and fill the gap with sealant
Slide down the retaining band and
tighten the band and install the locking
band over the flanges
Install the insulation (DIS only)
Distance X
Cut to X + 1”
Cut to X + 5/8”
Cut to X
(DIS only)
Cut 1.25” in the bend to
clear the locking band
Install interior assembly
between two parts
Install the outer shell by inserting
the crimped end under the male
coupling first
Tighten the bolts
and install the
locking bands