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111923-01B
For more information, visit www.desatech.com
For more information, visit www.desatech.com
8
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. Horizontal installations using round termina-
tion require exterior portion of wall firestop (see Figure 14, page 10).
1. Set the fireplace in its desired location and determine 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 configurations for venting with horizontal termination
that will help you decide which application best suits your in-
stallation. 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 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
sections together and twist one section clockwise approxi-
mately one-quarter turn until the sections are fully locked
(see Figure 8).
Note:
Horizontal runs of vent must be sup-
ported every three feet. Use wall straps for this purpose.
3. Use a 45° elbow to connect venting system to fireplace flue col-
lar. 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 subassemblies
for convenience.
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).
VENTING INSTALLATION
INSTRUCTIONS
Continued
VENTING INSTALLATION INSTRUCTIONS
Installation Planning
Figure 8 - Vent Pipe Connections
Female Locking Lugs
Male
Slots
(Framing
Detail)
10
3
/4"
(273mm)
10
3
/4" Inside Framing
(273mm)
10
3
/4"
(273mm)
8
1
/2"
(216mm)
Vent Opening
Combustible Wall
Vent Opening
Noncombustible Wall
Figure 9 - Vent Opening Requirements
Center
of Hole