DuraVent DuraStack Installation - Manual (Page 23)

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X min. = EXPANSION + 3 [inch]
EXPANSION = (length[feet]/100)x( ∆ T[°F]/100)
Operating Temp. [°F] Max distance with one Adjustable length [feet]
200 200
300 133
400 100
500 80
800 50
1000 40
1200 33
1400 29
Table 15 : Maximum run with Adjustable length between two fixed points
ADJUSTABLE LENGTH
1.. .The.adjustable.length.(LA).is.used.for.two.functions,.one.is.to.make.
odd.lengths.and.the.other.to.serve.as.an.expansion.joint..
2.. .The.adjustable.length.may.be.used.when.internal.pressure.do.not.
exceed.6”.water.column.or.in.well.ventilated.areas..See.Figure 66
for good.positioning.of.the.adjustable.length.
3.. .The.adjustable.length.assembly.includes.a.sliding.inner.section,.two.
containing.rings,.one.compression.band,.a.graphite.packing.gasket,.
an.insulation.band.(DIS.only).and.a.telescopic.outer.casing..There.
is.a.tool.supplied.with.this.assembly..(see.Figure 67).
4.. .For.proper.installation,.the.adjustable.length.must.have.adequate.
overlap.and.sufficient.allowance.for.thermal.expansion..(see.Figure
56.-.Adjustable.length.(LA),.and.table 15).
5.. .Installation steps (see.Figure 57):
a..Adjust.the.length.of.the.chimney.as.required...If.outer.casing.
or.inner.flue.are.too.long,.they.may.be.cut.to.length...You.must.
keep.the.overlap.of.the.outer.casing.to.at.least.1”...You.are.only.
authorised.to.cut.on.the.outer.casing.section.attached.to.the.
female.coupling..See.Figure 52.
b..Move.up.the.sliding.section.of.the.outer.wall.to.access.inner.
wall...See.Figure 53.
c..Tighten.the.compression.band.so.that.the.graphite.packing.is.
firmly.registered.against.the.inner.flue..See.Figure 54.
d..Tighten.all.the.bolts.of.the.containing.ring...For.each.bolt,.use.
the.supplied.tool.as.a.guide.between.the.two.containing.rings..
(see.Figure 55).
e..Fill.the.gap.between.the.inner.flue.and.outer.casing.with.the.
supplied.insulation.band..See.Figure 56 (DIS.only).
f.. Move.down.the.sliding.section.of.the.outer.wall.to.the.flange.of.
the.female.coupling.and.install.the.locking.band.as.described.in.
section.A:.Chimney.and.fitting.joint.assembly...See Figure 57.
Figure 58 - Adjustable length
Figure 52 - Adjustable length , INSTALLATION STEP A
Desired length
Figure 55 - Adjustable length, INSTALLATION STEP D
Supplied tool
Desired length
Move outer casing
Figure 53 - Adjustable length, INSTALLATION STEP B
Figure 56 - Adjustable length, INSTALLATION STEP E Figure 57 - Adjustable length , INSTALLATION STEP F
Figure 54 - Adjustable length, INSTALLATION STEP C
NOTE:.DIAGRAMS.&.ILLUSTRATIONS.ARE.NOT.TO.SCALE.
Wrench
Compression band Insulation band (DIS only)
Graphite packing
Containing ring
Telescopic
outer casing
1” Min.
overlap
X Min.