Desa CB36N - Manual (Page 10)

www.desatech.com 117437-01D 10
In.each.case.the.offsets.must.be.supported.
and firestops must be positioned wherever
the vent must pass through a sub-floor, ceil-
ing joist or an attic overhang. The vent pipe
must.terminate.vertically.into.a.listed.type.vent.
cap and extend a sufficient height through
an approved roof flashing, roof jack or a roof
thimble..At. all. points. the. listed. clearances.
must.be.maintained.
Vent.terminations.must.be.located.in.accor-
dance.with.height.and.proximity.rules.of.NFPA
No. 54.or.CAN/CSA B149..These.rules.apply.
to.vents.at.1".diameter.or.less.and.require.a.
minimum.height.in.accordance.with.the.roof.
pitch.and.a.minimum.of.8.foot.distance.from.a.
vertical.wall.or.obstruction.(see.Figure.11).
If venting horizontally through a side wall be-
comes necessary, a listed thimble approved
for.use.with.B-type.vent.must.be.used..Check.
with.your.local.codes.before.venting.through.
a.side.wall. Some.codes.areas.allow.the.use.of.existing.B-
type.vent.systems.if.the.system.is.at.or.above.
the recommended diameter of the flue.
The flue connection must be made using listed
B-type. connectors. and. the. existing. system.
must.be.code.inspected.for.damage.and.proper.
installation.
It.is.not.recommended.that.this.appliance.be.
common.vented.with.and.existing.gas.burning.
appliance. However, if it becomes necessary
to.common.vent.the.appliance..The.venting.
system must be sized and configured in ac-
cordance. with. the. common. venting. guides.
Appendix. G. of. the. current. National Fuel
Gas Code NFPA No. 54/ANSI Z223.1.and.in.
Canada.with.CAN/CSA B149.
Note: Before connecting this appliance to an
existing vent system or a common venting
system consult with your local architect plan-
ner, or building official.
VENTING INSTALLATION
Continued
Lowest
Discharge
Opening
Listed
Vent Cap
8 Ft. Min.
Roof Pitch x/12
Listed Clearance
12
x
Listed
Gas
Vent
H (Min)
Height
From Roof
Figure 11 - B-Vent Termination
Roof Pitch H (Min.)
Flat.to.6/1 1.0.ft.(0.3.m)
6/1.to.7/1 1.5.ft.(0.38.m)
Over.7/1.to.8/1 1.5.ft.(0.46.m)
Over.8/1.to.9/1 .0.ft.(0.61.m)
Over.9/1.to.10/1 .5.ft.(0.76.m)
Over.10/1.to.11/1 3.5.ft.(0.99.m)
Over.11/1.to.1/1 4.0.ft.(1..m)
Over.1/1.to.14/1 5.0.ft.(1.5.m)
Over.14/1.to.16/1 6.0.ft.(1.83.m)
Over.16/1.to.18/1 7.0.ft.(.13.m)
Over.18/1.to.0/1 7.5.ft.(.7.m)
Over.0/1.to.1/1 8.0.ft.(.44.m)
Figure 10 - Typical B-Vent Configuration
Maintain
Listed
Clearance
Maintain
Listed
Clearance
12' Min.
12' Min.
45°
45
6'
8'
12' Min.
60
45
Position
Firestop Position
Firestop
Position
Firestop
Listed
Vent Cap
Listed
Vent Cap
Listed
Vent Cap
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Support Each
Lateral At
Least Every
6 Feet
Maintain
Listed
Clearance
10'
EXAMPLE 3 EXAMPLE 2
EXAMPLE 1