Desa (V)T32EN-A Series - Manual (Page 13)

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VENTING INSTALLATION
INSTRUCTIONS
Continued
Flat Ceiling Installation
1. Cut a 10 3 /
4
" square hole in the ceiling using the locating hole as
a center point. The opening should be framed to 10 3 /
4
"x10 3 /
4
"
(273 mm x 273 mm) inside dimensions, as shown in Figure 9 on
page 8 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 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
8, page 8).
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
"x10 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 9, page 8.
4. Connect a section of pipe and extend up through the hole.
Note: If an offset is needed to avoid obstructions, you must sup-
port the vent pipe every 3 feet. Use wall straps for this purpose
(see Figure 19, page 12). 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 overlaps the top edge
of the flashing as shown in Figure 19, page 12. 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 6. 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.
Figure 20 - Installing Firestop
If area above is not a room, install
firestop below framed hole.
If area above is a room or
insulated area, install firestop
above framed hole.
7. Twist-lock the vent cap onto the last 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 allow-
able clearances to combustibles. Do not fill any of the required air
spaces with insulation.
VENTING INSTALLATION INSTRUCTIONS
Installation for Vertical Termination (Cont.)
Vertical Termination Configurations
Figures 21 through 24 show four different configurations for verti-
cal termination.
Figure 21 - Vertical Venting Configuration Using Two 90°
Elbows with Two Horizontal Runs (Vertical Round High Wind
Termination Shown)
Venting with Two 90° Elbows
Vertical (V) Horizontal (H
1
) +
Horizontal (H
2
)
5' min. 2' max.
6' min. 4' max.
7' min. 6' max.
8' min. 8' max.
20' max. 8' max.
Note: Install
restrictor into inner
collar of fireplace
as shown.
45° Elbow