DuraVent DuraStack Installation - Manual (Page 9)

NOTE:.DIAGRAMS.&.ILLUSTRATIONS.ARE.NOT.TO.SCALE.
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SECTION B - TEES, ELBOWS, INCREASERS
90° TEE (T90)
1.. .Generally.used.to.connect.the.horizontal.length.from.the.appliance.to.the.
vertical.length.when.clean-outs.access.or.drain.is.required.
2.. .90°.should.not.be.used.for.changing.flow.direction.in.diesel.or.turbine.
exhaust.
3.. .For.supporting.the.tee,.the.preferred.location.is.above.the.tee.(see.figure
9).
4.. .If.it.is.not.possible.to.suspend.the.tee,.it.may.be.supported.from.the.
base.(see.figure 10)...When.this.is.necessary,.a.short.length.should.be.
installed.between.the.tee.and.the.tee.cap.or.Drain-Tee.Cap.for.a.good.
clean-out.or.inspection.access.
IMPORTANT NOTE:
If more than 1/4” of thermal expansion is expected between a stationary
point and the tee, the use of an expansion length and a two axis support
is recommended to minimize bending moments on the tee (see.figure.11
and table 9).
Gas Temperature Rise Maximum Length Expansion
200°F 12’0” 0.25”
300°F 8’0” 0.25”
400°F 6’0” 0.25”
500°F 5’0” 0.25”
600°F 4’0” 0.25”
700°F 3’6” 0.25”
800°F 3’0” 0.25”
900°F 2’6” 0.25”
1000°F 2’0” 0.25”
Note: 60°F - 70°F ambient T°
Table 9 - Maximum allowable length between two fixed points
without expansion length
Figure 10 - Base Supported Tee
45° TEE (T45)
1.. .For.systems.where.flow.resistance.must.be.minimized.like.engine.or.
turbine.exhaust...The.use.of.a.45°.tee.is.suggested...It.can.be.combined.
with.a.45°.elbow.to.make.a.smooth.90°.turn.(see.figure 12)...To.support.
this.tee,.use.similar.method.as.a.90°.tee.
2.. .When.using.45°.tee.to.connect.multiple.appliances.together,.thermal.
expansion.must.be.considered...Thus.prepared.to.prevent.bending.mo-
ments.on.the.tee,.an.expansion.length.must.be.installed.between.the.tees.
(see.figure 13).
45° TEE Y (TY)
1.. .This.kind.of.tee.is.useful.where.the.stack.is.located.between.two.applica-
tion.or.with.a.double.exhaust.system...Use.the.same.support.method.and.
thermal.expansion.considerations.from.the.other.tees.(see.figure 14).
Figure 9 - Suspended Tee
Wall
Support
Tee
Tee Cap or
Drain-Tee Cap
Wall Support
Tee
Tee Cap or
Drain-Tee Cap
Short Length
Lengths
Stationary
Support
Suspension
Band
Expansion
Length
Stationary
Support
More than 1/4” of expected thermal
expansion between two stationary points Figure 11 - Two Axis Support
Figure 12 - Smooth 90° Turn
Appliance
Expansion
Length
45° Elbow
45° Tee Y
Increaser
Figure 14 - 45° Tee Y
Stationary / Fix
Support
Increaser Expansion
Length
45° Tee
Appliance Appliance Appliance
Figure 13 - Multiple appliance connection with 45° tees