Hearth Extension - Desa PN36-A Owners Manual And Installation Manual

FirePlace insTallaTion
Continued
2. If fireplace is to be installed directly on
carpeting, tile (other than ceramic) or any
combustible material other than wood
flooring, fireplace must be installed upon
a metal or wood panel extending full width
and depth of fireplace.
3. Set fireplace directly in front of opening
and slide unit back until nailing flanges
touch side framing.
4. Check the level of fireplace and shim with
sheet metal if necessary.
5. Before securing fireplace to prepared
framing, ember protector (provided) must
be placed between hearth extension (not
supplied) and under bottom front edge of
fireplace to protect against glowing embers
(see Figure 7). If fireplace is to be installed
on a raised platform, a Z-type ember pro-
tector (not supplied) must be fabricated
to fit your required platform height (see
Figure 6). The ember protector should be
made of galvanized sheet metal (28 gauge
minimum) to prevent corrosion.
6. Using screws or nails, secure fireplace to
the framing through flanges located on
sides of the fireplace (see Figure 8).
Platform Must Be Solid,
Flat, and Fully Supported
"Z" Type Metal
Safety Shields
Not Supplied
Figure 6 - Framing Firebox with "Z" Type
Ember Protectors
115607-01C
39 7
48 1 / " Min.
2
*
*As Required by Design
As Long as Ceiling
Clearance is Maintaned
www.desatech.com
1/2" MIN.
OVERLAP
Figure 7 - Ember Protectors
1/2"
Minimum to
Combustibles
Nailing
Flanges
Prepared
Framing
Figure 8 - Nailing Flanges

HEARTH ExTENSION

/ "
8
A hearth extension projecting a minimum of
16" in front of and a minimum of 8" beyond
each side of the fireplace opening is required
22 / "
5
8
to protect combustible floor construction
in front of fireplace (see Figure 9, page 6).
Fabricate a hearth extension using a material
which meets the following specifications: a
layer of noncombustible, inorganic material
having a thermal conductivity of K=0.84 BTU
IN/FT, HR. F (or less) at 1" thick. For example,
if the material selected has a K factor of 0.25,
such as glass fiber, the following formula
would apply:
0.25 x 1.0" = 0.30" thickness required
0.84
Thermal conductivity "K" of materials can be
obtained from manufacturer or supplier of
noncombustible material.
If hearth extension is to be raised, a "Z" type
ember protector must be used (see Figure 6
and Figure 10, page 6)
1/2" MIN.
Nails or
Screws
5