Desa CD36TN-M - Manual (Page 15)

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VENTING INSTALLATION INSTRUCTIONS
Continued
INSTALLATION FOR vERTICAL
TERMINATION
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 19) to avoid cut-
ting load bearing members. Note: Pay special
attention to these installation 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 the venting system and any
maximum horizontal offset limitations.
2. Set the fireplace in desired location. Drop a
plumb line down from the ceiling to the posi-
tion 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.
Figure 19 - 45° and 30° Offset with Wall
Strap
Roof
Flashing
Wall
Strap
45°
Elbows
WS-58
Wall Strap
 -  x 4
Vertical
Header
OSR58-30
30° Offset
Return
Horizontal
Frame Member
Flat Ceiling Installation
1. Cut a 10 3 /
4
" square hole in the ceiling using
the locating hole as a center point. The open-
ing should be framed to 10 3 /
4
" x 10 3 /
4
" inside
dimensions, as shown in Figure 11 on page
11 using framing lumber the same size as the
ceiling joists. If the area above the ceiling is
an insulated ceiling, you must use the firestop
thimble and special firestop included with the
kit to prevent insulation from contacting the
vent pipe (see Thimble Installation, page 16).
Otherwise, install firestop below the framed
hole. The firestop should be installed with no
less than three nails per side (see Figure 20).
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 Figure 10, page 11).
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 3 /
4
" x 10 3 /
4
" 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 materials. Frame the opening as
shown in Figure 11, page 11.
4. Connect a section of pipe and extend up
through the hole.
Note: If an offset is needed to avoid obstruc-
tions, you must support the vent pipe every 3
feet. Use wall straps for this purpose (see Fig-
ure 19). 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.
Figure 20 - Installing Firestop
If area above is a room, install firestop
above framed hole.
If area above is an insulated area, install
firestop below framed hole.