Astria.us.com
126653-01_E
6
FIREPLACE INSTALLATION
Continued
2. If fireplace is to be installed directly on carpeting, tile 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 this opening and slide unit back
until nailing flanges touch side framing.
4. Check 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 sup-
plied) and under bottom front edge of fireplace to protect against
glowing embers falling through (see Figure 7). If fireplace is to
be installed on a raised platform, a Z-type ember protector (not
supplied) must be fabricated to fit your required platform height
(see Figure 6). The ember protector should extend under fireplace
a minimum of 1 1/2". The ember protector should be made of
galvanized sheet metal (28 gauge minimum) to prevent corrosion.
6. Using screws or nails, secure fireplace to framing through flanges
located on sides of fireplace (see Figure 8).
Figure 6 - Framing Firebox with “Z” Type Ember Protectors
Figure 7 - Ember Protectors
Ember Protector
(Typ. 2 of 2)
1/2" (1.2 cm)
Max.
Figure 8 - Nailing Flanges
HEARTH EXTENSIONS
A hearth extension projecting a minimum of 16" in front of and a
minimum of 8" beyond each side of fireplace opening is required to
protect combustible floor construction in front of fireplace. Fabri-
cate a hearth extension using a material which meets the following
specifications: a layer of noncombustible, inorganic material having
a thermal conductivity of k = .84 BTU IN/FT
2
HR °F (or less) at 1"
thick. For example, if 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 manu-
facturer 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 7).
WARNING: Hearth extension is to be installed
only as shown in Figure 9.
NONCOMBUSTIBLE
HEARTH EXTENSION
52
1
/
2
" MIN.
(133.3cm)
36
1
/
2
" MIN.
(92.7cm)
8" MIN.
(20.3cm)
16" MIN.
(40.6cm)
Figure 9 - Hearth Extension
As Required by Design as Long
as Ceiling Clearance Is Maintained
54"
(137.1
6 cm
)
Min.
44
3
/
4
"
(113.67 cm)
Min.
Platform Must be
Solid, Flat and
Fully Supported
24"
(60.96 cm
)
"Z" Type
Ember Protector
(Not Supplied)
*38
3
/
4
"
(98.43
cm)
Nailing
Flanges
Prepared
Framing
Nails or
Screws
1" Clearance is
Not Required at
Nailing Flanges
*A header
must be
installed after
fireplace is set
in place
