Desa (V)T32EN SERIES - Manual (Page 14)

www.desatech.com 111987-01D 14
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.
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" x 10" inside dimen-
sions, as shown in Figure 9 on page 9 using
framing lumber the same size as the ceiling
joists. If the area above the ceiling is an insu-
lated ceiling or attic space, nail firestop from
the top side. This prevents loose insulation from
falling into the required clearance space. If the
area above the ceiling is a living space, install
firestop below the framed hole. The firestop
should be installed with no less than three nails
per side (see Figure 20, page 15).
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 8, 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" x 10"
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 9, page 9.
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.
5. Place the flashing over the pipe section(s)
extending through the roof. Secure the base
of the flashing to the roof and framing with
roofing nails. Be sure roofing material over-
laps the top edge of the flashing as shown in
Figure 19. 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 7 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.
VENTING INSTALLATION
INSTRUCTIONS
Continued
Figure 19 - Offset with Wall Strap and 45°
Elbows
45° Elbow
Wall Strap
Roof Flashing
Ceiling Firestop