Lennox Hearth Brentwood SP - Manual (Page 8)

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
7a, 7b and 8):
A. Frame the fireplace using 2” x 3” or heavier
lumber.
B. WARNING: Combustible materials
cannot 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) measured 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 8). 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 support
the facing and mantel.
D. WARNING: The fireplace must not be
in contact with any insulation or loose
filling material. Cover the insula-
tion with Drywall panels around the
fireplace.
Hearth Extension Requirements
The Brentwood fireplace may be installed
directly on a combustible floor. The supplied
safety metal strip must be positioned as fol-
lows: 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 7a).
* The safety metal strip must cover the entire
width of the fireplace
The combustible floor in front of the fireplace
must be covered with a non-combustible
material (tile, marble, stone, etc). See Figures
7a and 7b.
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.
Figure 7b - Hearth Extension Requirements
Area where wood
Mantel can be
installed
Non-Combustible Material
45 Deg.
18”
36”
4”
17” Min.
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 0° F (-18° C).
(102mm)
(914mm) (432mm)
(457mm)
45”
(1143mm)
Min.
Hearth
Extension
Mantel
8 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
WARNING: THE HEARTH EXTEN-
SION IS TO BE INSTALLED ONLY
AS ILLUSTRATED.
The crack between the fireplace
and the hearth extension must be
sealed with a non-combustible
material such as sand-cement
grout.
Safety Metal Strip
Hearth Extension
Non-Combustible
Finish Material
Floor
Figure 7A - Hearth Extension Requirements
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