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105706-01B
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WARNING: Read all instructions completely and
thoroughly before attempting installation. Failure to
do so could result in serious injury, property damage
or loss of life. Operation of improperly installed and
maintained venting system could result in serious
injury, property damage or loss of life.
WARNING: Seal all pipe to pipe connections with
high temperature silicone (600°F/316° C) every time
a vent connection is made. Before joining elbows
and pipes, apply a bead of high temperature silicone
sealant (GE RTV 106/Loctite RTV 81585) to the end of
the elbow or pipe. High temperature silicone must
also be used to re-seal any connections after main-
tenance to venting system.
NOTICE: Failure to follow these instructions will void
the warranty.
INSTALLATION PRECAUTIONS
Consult local building codes before beginning the installation. The
installer must make sure to select the proper vent system for installa-
tion. Before installing vent kit, the installer must read this fireplace
manual and vent kit instructions.
Only a qualified service person should install venting system. The
installer must follow these safety rules:
• Wear gloves and safety glasses for protection
• Use extreme caution when using ladders or when on roof tops
• Be aware of electrical wiring locations in walls and ceilings
The following actions will void the warranty on your venting system:
• Installation of any damaged venting component
• Unauthorized modification of the venting system
• Installation of any component part not manufactured or approved
by DESA International
• Installation other than as instructed by these instructions
WARNING: This gas fireplace and vent assembly
must be vented directly to the outside. The venting
system must NEVER be attached to a chimney serv-
ing a separate solid fuel burning appliance. Each gas
appliance must use a separate vent system. Do not
use common vent systems.
VENTING INSTALLATION
WARNING: Horizontal sections of this vent sys-
tem require a minimum clearance of 2" from the top
of the pipe and 1" minimum to the sides and bottom.
Vertical sections of this system require a minimum of
1" clearance to combustible materials on all sides of
the pipe.
INSTALLATION PLANNING
There are two basic types of direct-vent installation:
• Horizontal Termination
• Vertical Termination
It is important to select the proper length of vent pipe for the type of
termination you choose. It is also important to note the wall
thickness.
For Horizontal Termination: Select the amount of vertical rise
desired. The horizontal run of venting must have 1/4" rise for every
12" of run towards the termination.
WARNING: Never run the vent downward as this
may cause excessive temperatures which could
cause a fire.
You may use one or two 90° elbows in this vent configuration. See
Horizontal Termination Configurations on page 12.
For Vertical Termination: Measure the distance from the fireplace
flue outlet to the ceiling. Add the ceiling thickness, the vertical rise in
an attic or second story, and allow for sufficient vent height above the
roofline. You may use one or two 90° elbows in this vent configura-
tion. See Vertical Termination Configurations on pages 14 and 15.
Note:
You may use two 45° elbows in place of a 90° elbow. You
must follow rise to run ratios when using 45° elbows.
For two-story applications, firestops are required at each floor
level. If an offset is needed in the attic, additional pipe and elbows
will be required.
You may use a chase with a vent termination with exposed pipe on the
exterior of the house. See Installing Vent System in a Chase, page 10.
Your Vanguard direct-vent fireplace has been tested for a minimum
3' rise with a maximum 10" wall thickness. The maximum horizon-
tal run is 20' with 8' vertical rise (see Installation for Horizontal
Termination, pages 10 and 11). The maximum vertical run is 30' (see
Installation for Vertical Termination, pages 13 and 14).
It is very important that the venting system maintain its balance
between the combustion air intake and the flue gas exhaust. Certain
limitations apply to vent configurations and must be strictly followed.
VENTING INSTALLATION
Installation Precautions
Installation Planning
NOTICE: Do not seal termination cap to pipe. Cap
must be removable for servicing vent system.