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INSTALLATION pLANNING
There are two basic types of direct-vent
installation:
• 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 20, page 15).
1. Set fireplace in its desired location and
determine route your horizontal venting
will take. Do not secure fireplace until all
venting has been installed. Some instal-
lations require sliding fireplace in and out
of position to make final venting connec-
tions. Figures 18 through 25 on pages 14
through 17 show different configurations
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 venting route. If they are, you may
want to adjust location of fireplace.
2. Direct vent pipe sections and components
are designed with special twist-lock con-
nections.
Twist-Lock procedure: Female ends of
pipes have locking lugs (indentations).
These lugs will slide straight into match-
ing slots on male ends of adjacent pipes.
Push pipe sections together and twist
one section clockwise approximately one-
quarter turn until sections are fully locked
(see Figure 11).
Note: Horizontal runs of vent must be sup-
ported every three feet. Use wall straps
for this purpose.
3. Any straight pipe section, a 45° or 90°
elbow can be used when first connecting
the venting system to fireplace. Elbows
are designed to twist-lock into any of four
90° positions to direct the venting system
to the desired location. IMPORTANT: Do
not attempt to alter the configuration of
elbow by cutting, twisting, bending, etc.
4. Assemble desired combination of pipe
and elbows to fireplace flue collar. If there
are long portions of venting run, preas-
sembled pipe sections may be installed
as subassemblies for convenience.
1
VENTING INSTALLATION
Continued
5. Carefully determine location where vent
(29.2 cm)
Noncombustible Wall
(21.6 cm)
www.desatech.com
pipe assembly will penetrate outside wall.
Center of hole should line up with center
line of horizontal vent pipe. Mark wall for a
11
/
" x 11
/
" square hole. Cut and frame
1
1
square hole in exterior wall where vent will
be terminated. If wall being penetrated is
constructed of noncombustible material,
such as masonry block or concrete, a
8
/
" hole with zero clearance is accept-
1
able (see Figure 12).
Female
Locking Lugs
Figure 11 - Vent Pipe Connections
Vent O pening
Combustible Wall
1
11
/
"
2
(29.2 cm)
1
11
/
"
2
(Framing
Detail)
Vent Opening
1
8
/
"
2
Figure 12 - Vent Opening Requirements
Male
Slots
1
11
/
" Inside Framing
2
(29.2 cm)
Center
of Hole
116035-01J
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