Desa VVF36 Owner's Operation And Installation Manual page 16

. Note: Pay special attention to these instal-
lation instructions for required clearances
(air space) to combustibles when passing
through ceilings, walls, roofs, enclosures,
attic rafters, etc. Do not pack air spaces
with insulation. Also note maximum
vertical rise of venting system and any
maximum horizontal offset limitations.
Offsets must fall within parameters shown
in Figure 25.
2. Set fireplace in desired location. Drop a
plumb.line.down.from.ceiling.to.position.
of fireplace exit flue. Mark center point
where. vent.will. penetrate. ceiling.. Drill. a.
small.locating.hole.at.this.point.
. Drop.a.plumb.line.from.inside.of.roof.to.
locating.hole.in.ceiling..Mark.center.point.
where.vent.will.penetrate.roof..Drill.a.small.
locating.hole.at.this.point.
Lowest.
Listed.
Discharge.
Vent.Cap
Opening
8'.
Minimum
Listed.
Gas.
Vent
H.(Min.).Height.from.Roof
ROOF PITCH
Flat.to.6/1
6/1.to.7/1
Over.7/1.to.8/1
Over.8/1.to.9/1
Over.9/1.to.10/1
Over.10/1.to.11/1
Over.11/1.to.1/1
Over.1/1.to.14/1
Over.14/1.to.16/1
Over.16/1.to.18/1
Over.18/1.to.0/1
Over.0/1.to.1/1
Figure 25 - Vertical Vent Termination
Clearance
16
VENTING INSTALLATION
Continued
X
12
Roof.Pitch.is.
x.1.Listed.
Clearance
H (Min.)
1.0'
1.5'
1.5'
.0'
.5'
3.5'
4.0'
5.0'
6.0'
7.0'
7.5'
8.0'
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Flat Ceiling Installation
1.. Cut.a.1. / " square hole in the ceiling us-
1

ing.locating.hole.as.a.center.point..Open-
ing.should.be.framed.to.1.
inside dimensions, as shown in Figure
18 on page 13, using framing lumber the
same size as ceiling joists. If area above
ceiling is an insulated ceiling or an attic,
nail firestop from top side. This prevents
loose insulation from falling into required
clearance.space..If.area.above.ceiling.is.a.
living space, install firestop below framed
hole. The firestop should be installed with
no. less. than. three. nails. per. side. (see.
Figure.6).
.. Assemble. desired. lengths. of. pipe. and.
elbows necessary to reach from fireplace
flue up through firestop. Be sure all pipe
and. elbow. connections. are. fully. twist-
locked (see Figure 17, page 13).
3.. Cut.a.hole.in.roof.using.locating.hole.as.
a.center.point..(Cover.any.exposed.open.
vent.pipes.before.cutting.hole.in.roof.).The.
1. / ".x.1. /
1 1
 
on the horizontal, actual length may be
larger.depending.on.pitch.of.roof..There.
must.be.a.1".clearance.from.vent.pipe.to.
combustible.materials..Frame.opening.as.
shown.in.Figure.18.on.page.13.
If area above is an attic, install firestop
above.framed.hole.
If area above is a living space, install
firestop below framed hole.
Figure 26 - Installing Firestop
/ ".x.1.
1

".hole.must.be.measured.
/ ".
1

56131H