Desa (V) CD36R(N - Manual (Page 14)

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45° Elbow
Wall Strap
Roof Flashing
Ceiling Firestop
VENTING INSTALLATION INSTRUCTIONS
Installation for Vertical Terminations
VENTING INSTALLATION
INSTRUCTIONS
Continued
Note: Vertical restrictor must be installed in all vertical installations.
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 26) to avoid cutting load
bearing members. NOTE: Pay special attention to these instal-
lation instructions for required clearances (air space) to com-
bustibles when passing through ceilings, walls roofs, enclo-
sures, attic rafters, etc. Do not pack air spaces with insulation.
Also note maximum horizontal offset limitations.
2. Set fireplace in desired location. Drop a plumb line down
from the ceiling to the position of the fireplace 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.
Flat Ceiling Installation
1. Cut a 10 ¾” square hole in the ceiling using the locating hole as
a center point. The opening should be framed to 10 ¾” x 10 ¾”
(273 mm x 273 mm) inside dimensions, as shown in Figure 12
on page 9 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 insula-
tion 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 27).
Figure 26 - Offset with Wall Strap and 45° Elbows
2. Assemble the desired lengths of pipe and elbows necessary to
reach from the fireplace flue up through the firestop. Be sure
all pipe and elbow connections are fully twist-locked (see Fig-
ure 11, page 9).
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 ¾” x 10 ¾” hole must be measured on the horizontal;
actual length may be larger dependiong on the pitch of the roof.
There must be a 1” clearance from the vent pipe to combustible
materials. Frame the opening as shown in Figure 12, page 9.
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 26). Whenever possible, use 45º elbows
instead of 90º elbows. The 45º 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 26. There must be
a 1” clearnace from the vent pipe to combustible materials
6. Continue to add pipe section until the height of the vent cap
meets the minimum building code requirements described in
Figure 10 on page 7. 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.
7. Twist-lock the vent cap onto the kast section of vent pipe.
Note:
If the vent pipe passes through any occupied areas above the
first floor, including storage spaces and closets, you must enclose
pipe. You may frame and sheetrock the enclosure with standard
construction material. Make sure and meet the minimum allowable
clearances to combustibles. Do not fill any of the required air spaces
with insulation.
If area above is a room, install If the area above is not a room, install
firestop above framed hole. firestop below framed hole.
Figure 27 - Installing Firestop