Desa (F)SDVBNC Owner's Operation And Installation Manual page 16

VENTING INSTALLATION
16
Installation for Vertical Termination
VENTING INSTALLATION
Continued
INSTALLATION FOR VERTICAL
TERMINATION
NOTICE: Use rigid pipe only. Flex venting is not to be
used with a vertical termination.
1. Determine the route your vertical venting will take. If ceiling
joists, roof rafters, or other framing will obstruct the venting
system, consider an offset (see Figure 32) to avoid cutting
loadbearing members. Note: Pay special attention to these in-
stallation instructions for required clearances (air space) to com-
bustibles when passing through ceilings, walls, roofs, enclosures,
attic rafters, etc. Do not pack air spaces with insulation. Also
note maximum vertical rise of the venting system and any maxi-
mum horizontal offset limitations. Offsets must fall within the
parameters shown in Figures 36 through 38, pages 17 and 18.
2. Set the stove in desired location. Drop a plumb line down from
the ceiling to the position of the burner system exit flue. Mark
the center point where the vent will penetrate the ceiling. Drill
a small locating hole at this point.
Drop a plumb line from the inside of the roof to the locating
hole in the ceiling. Mark the center point where the vent will
penetrate the roof. Drill a small locating hole at this point.
Wall Strap
Figure 32 - Offset with Wall Strap and 45 Elbows
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For more information, visit www.desatech.com
Roof
Flashing
45 Elbow
Ceiling Firestop
Flat Ceiling Installation
1. Cut a 10" square hole in the ceiling using the locating hole as a
center point. The opening should be framed to 10"x10" (254mm
x 254mm) inside dimensions, as shown in Figure 25 on page
14 using framing lumber the same size as the ceiling joists. If
the area above the ceiling is an insulated ceiling or a room, nail
firestop from the top side. This prevents loose insulation from
falling into the required clearance space. Otherwise, install
firestop below the framed hole. The firestop should be installed
with no less than three nails per side (see Figure 33).
2. Assemble the desired lengths of pipe and elbows necessary
to reach from the burner system flue up through the firestop.
All connections must be sealed with high temperature sili-
cone sealant as specified in the second warning statement on
page 12. Be sure all pipe and elbow connections are fully
twist-locked (see Figure 24, page 13).
3. Cut a hole in the roof using the locating hole as a center point.
(Cover any exposed open vent pipes before cutting hole in roof.)
The 10"x10" hole must be measured on the horizontal; actual
length may be larger depending on the pitch of the roof. There
must be a 1" clearance from the vent pipe to combustible mate-
rials. Frame the opening as shown in Figure 25 on page 14.
4. Connect a section of pipe and extend up through the hole.
Note: If an offset is needed to avoid obstructions, you must
support the vent pipe every 3 feet. Use wall straps for this
purpose (see Figure 32). Whenever possible, use 45 elbows
instead of 90 elbows. The 45 elbow offers less restriction
to the flow of the flue gases and intake air.
5. Place the flashing over the pipe section(s) extending through
the roof. Secure the base of the flashing to the roof and fram-
ing with roofing nails. Be sure roofing material overlaps the
top edge of the flashing as shown in Figure 32. There must be
a 1" clearance from the vent pipe to combustible materials.
6. Continue to add pipe sections until the height of the vent cap
meets the minimum building code requirements described in
Figure 21 on page 11. Note : You must increase vent height
for steep roof pitches. Nearby trees, adjoining rooflines, steep
pitched roofs, and other similar factors may cause poor draft
or down-drafting in high winds. Increasing the vent height
may solve this problem.
If area above is a room, install
firestop above framed hole.
Figure 33 - Installing Firestop
If area above is not a
room, install firestop below
framed hole.
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