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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 1/4" rise for every 12" of run towards
the termination below 7
1
of the fi replace. With 7
1
the fl oor of the fi replace, the horizontal run may run level.
NEVER run vent piping down.
You may use up to three 90° elbows in this vent confi gura-
tion. Refer to Vertical/Horizontal Termination Confi gurations
on Page 15.
FOR VERTICAL TERMINATION
Measure the distance from the fi replace fl oor to the ceil-
ing. Add the ceiling thickness, the vertical rise in an attic
or second story, and allow for suffi cient 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°.
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.
Treatment of fi restops 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.
20306745
⁄
" feet of vertical rise from the fl oor
2
⁄
" feet or more vertical rise from
2
Never run the vent pipe level down. This
may cause excessive temperatures which
could cause a fi re.
For two-story applications, fi restops are required at each
fl oor 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.
Refer to Installing A Vent System in an Outside Chase
below. If pipe is enclosed in chase, it is not exposed.
It is very important that the venting system maintain its
balance between the combustion air intake and the fl ue
gas exhaust. Certain limitations apply to vent confi gurations
and must be strictly followed.
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.
Top Vent Vertical Side wall: Horizontal
sections of this vent system require a
minimum of 3" (76 mm) clearances to
combustibles at the top of the fl ue and 1"
(25 mm) clearance at the sides and bottom
until the fl ue penetrates the outside wall. A
minimum 1" clearance all around the fl ue
is acceptable at this point of penetration. If
1
vertical rise is 7
top venting, the clearance to combustibles
is 1" on all sides of the horizontal run.
VWDV70 Series Gas Fireplace
/
feet (2.3 m) or higher when
2
13
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