Desa O-T L (V)DVC36(B)(H) - Manual (Page 8)

www.desatech.com 118197-01C 8
INSTALLATION PLANNING
There are two basic types of direct-vent in-
stallation:
• Horizontal Termination
• Vertical Termination
horizontal Termination Installation
IMPORTANT:
Horizontal square terminations
require only inner portion of wall firestop. Hori-
zontal installations using round termination require
exterior portion of wall firestop (see Figure 14,
page 10.
1. Set the fireplace in its desired location and deter-
mine the route your horizontal venting will take.
Do not secure the fireplace until all venting has
been installed. Some installations require sliding
the fireplace in and out of position to make final
venting connections. Figures 14 through 18 on
pages 10 through 12 show different configura-
tions for venting with horizontal termination that
will help you decide which application best suits
your installation. Check to see if wall studs or
roof rafters are in the path of your desired vent-
ing route. If they are, you may want to adjust the
location of the fireplace.
2. Direct vent pipe sections and components are
designed with special twist-lock connections.
Twist-Lock Procedure:
The female ends of the
pipes have locking lugs (indentations). These
lugs will slide straight into matching slots on
the male ends of adjacent pipes. Push pipe sec-
tions together and twist one section clockwise
approximately one-quarter turn until the sections
are fully locked (see Figure 8). Note: Horizontal
runs of vent must be supported every three feet.
Use wall straps for this purpose.
3. Use a 45° elbow to connect venting system
to fireplace flue collar. The elbow is designed
to be twist-locked onto the flue collar as
described in step 2. IMPORTANT: Do not
attempt to alter the configuration of the elbow
by cutting, twisting, bending, etc.
4. Assemble the desired combination of pipe and
elbows to the fireplace flue collar. If there are
long portions of venting run, pre-assembled
pipe sections may be installed as subassem-
blies for convenience.
VENTINg INSTALLATION
INSTRUCTIONS
Continued
Figure 8 - Vent Pipe Connections
Female
Locking
Lugs
Male
Slots
(Framing
Detail)
10 3 /
4
"
10 3 /
4
" Inside Framing
10 3 /
4
"
8 1 / 2 "
Vent Opening
Combustible Wall
Vent Opening
Noncombustible Wall
Figure 9 - Vent Opening Requirements
Center of
Hole
5. Carefully determine the location where the vent
pipe assembly will penetrate the outside wall.
The center of the hole should line up with the
center-line of the horizontal vent pipe. Mark the
wall for a 10 3 /
4
" x 10 3 /
4
" square hole. Cut and
frame the square hole in the exterior wall where
the vent will be terminated. If the wall being
penetrated is constructed of noncombustible
material, such as masonry block or concrete,
a 8 1 /
2
" hole with zero clearance is acceptable
(see Figure 9).