Figure 15
Optional Cast Facade installation
Install the Facade per instructions provided in
Facade Kit (ordered separately - see
Page 27
).
Framing, Facing And Mantel
The construction of the framing, facing, and
mantel must be in accordance with the stan-
dards and the following illustrations (
Figures
16 and 17
):
A. Frame the fireplace using 2” x 3” or heavier
lumber.
B. WARNING: Combustible materials can-
not be used in the space directly above
the fireplace, except for the studs above
the facade that support the facing and
mantel. This area must remain empty
for a height of 6’8” (2,032 mm) mea-
sured from the base of the appliance.
C. Frame the fireplace with vertical studs at the
sides of the fireplace running from floor to
ceiling (see
Figure 16
).
If combustible facing
is to be used, position the studs back, from
the front edge of the fireplace (a space that
is the thickness of the facing material, so
that the facing can be installed flush with the
fireplace facing). Frame headers between
the vertical studs only as follows:
• Place 2” x 3” or 2” x 4” headers,
only along the upper part of the front,
side and back faces (some codes
may require a 2” x 6” on an outside
bearing wall). Do not put wood or
any combustible material within the
area above the fireplace except on the
front facing.
• Place headers only as required to sup-
port the facing and mantel.
D. WARNING: The fireplace must not be in
contact with any insulation or loose fill-
ing material. Cover the insulation with
drywall panels around the fireplace.
HEARTH EXTENSION REQUIREMENTS
The WRT3920WS fireplace may be installed
directly on a combustible floor. The supplied
safety metal strip must be positioned as follows:
One half under the front of the fireplace and the
other half must extend on the floor over which
the hearth extension will be built (see
Figure 14
).
* The safety metal strip must cover the entire
width of the fireplace
The combustible floor in front of the fireplace
must be covered with at least a 1/2 inch of
non-combustible material (tile, marble, stone,
etc). See
Figure 15
.
COLD CLIMATE INSTALLATIONS
Climates where temperatures will fall below
32° F (0° C).
The heating performance of the appliance will
vary depending upon the level of insulation,
house design, how the appliance is operated, etc.
If this fireplace is being installed in a cold
climate, it is especially important to seal all
cracks around the fireplace and wherever cold
air could enter the room with noncombustible
material.
Also, the outside air inlet duct should be wrapped with noncombustible insulation to minimize
the formation of condensation.
Do not place insulation materials directly against the chimney sections. We recommend that
you use the insulated wall radiation shield since it will maintain the home’s thermal barrier. AC
chimney is NOT recommended in very cold climates (in areas with temperatures below 32°F (-0°C).
WARNING: THE HEARTH EXTEN-
SION IS TO BE INSTALLED ONLY
AS ILLUSTRATED.
Hearth extension of an elevated fireplace
must respect the same minimal dimensions
as a fireplace installed directly on the floor.
Figure 14 - Hearth Extension Requirements
The crack between the fireplace
and the hearth extension must be
sealed with a non-combustible ma-
terial such as sand-cement grout.
Safety Metal Strip
Hearth Extension Non-Combusti-
ble Finish Material
Floor
Fireplace
1/2”
13mm
u
Elevated fireplace installations
require a special “Z” Metal
Safety Strips (field provided),
in place of the safety metal strip
shown above. The safety strip
should extend the full width of
the fireplace. When more than
one safety strip is used they must
overlap by a minimum of 1”.
Platform
2”
Fireplace
Elevated Fireplaces
u
39”
(990mm)
Min.
18”
Area where wood mantel
can be installed
Non-Combustible Material
45 Deg.
4”
32-3/4”
17” Min.
Hearth
extension
(457mm)
Min.
(832mm)
Min.
(432mm)
(102mm)
Mantel
12” Max.
(305mm)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
14
