Installation Planning; Horizontal Termination; Vertical Termination - Vermont Castings Lexington LX32DV Installation And Operating Instructions Manual

VeNtING INStALLAtIoN

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. All horizontal
run of venting must have minimum 1/4" rise for every 12"
of run towards the termination.
You may use up to three 90° elbows in this vent configura-
tion. Refer to Horizontal (Through the Wall) Termination
Configurations on Page 18.
FoR VeRtIcAL teRMINAtIoN
Measure the distance from the fireplace floor to the ceil-
ing. Add the ceiling thickness, the vertical rise in an attic
or second story, and allow for sufficient vent height above
the roof line.
Note: You may use two 45° elbows in place of a 90° elbow.
You must follow rise to run ratios when using 45° elbows.
The appliance is approved for use with three 90° elbows
maximum or a combination of 90° and 45° elbows up to
a maximum of 270°.
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 below. If pipe is enclosed in chase, it
is not exposed.
It is very important that the venting system maintain its bal-
ance between the combustion air intake and the flue gas
exhaust. Certain limitations apply to vent configurations
and must be strictly followed.
treatment of firestops and construction of
the chase may vary from building type to
building type. these instructions are not
substitutes for the requirements of local
building codes. you must follow all local
building codes.
51D0528
LX Series Direct Vent Gas Fireplace
Never run the vent pipe level or downward.
this may cause excessive temperatures
which could cause a fire.
INStALLING A VeNt SySteM IN AN
outSIDe chASe
A chase is a vertical boxlike structure built to enclose
venting that runs along the outside of a building. A chase
is required for such venting.
When installing in a chase, you should
insulate the chase as you would the outside
walls of your home. this is especially
important in cold climates. Insulation
should be considered a combustible
material. Maintain proper clearances to all
combustible materials.
Always maintain minimum clearances
around vent systems. the minimum
clearances to combustibles for horizontal
vent pipe are 3" at the top and 1" at the
sides and bottom of the vent system until
the pipe penetrates the nearest vertical wall.
A 1" minimum clearance all around the pipe
must be maintained. Do not pack the open
air spaces with insulation or other materials.
this could cause high temperatures and
may present a fire hazard.
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