FMI S42 - Manual (Page 5)

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DRAIN PAN (DP42)
For outdoor installations, the fireplace enclo-
sure must allow for adequate drainage and
fresh air ventilation. It is recommended that
a sealed, corrosion resistant catch pan with
provision for drainage be installed under the
fireplace within the fireplace enclosure (see
Accessories, page 16).
HEARTH EXTENSION
A hearth extension projecting a minimum of
20" in front of and a minimum of 12" beyond
each side of the fireplace opening is required
to protect combustible floor construction
in front of the fireplace. Fabricate a hearth
extension using a material which meets the
following specifications: a layer of noncom-
bustible, 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 the manufacturer or supplier of
the noncombustible material. If the hearth ex-
tension is to be covered, use noncombustible
material such as tile, slate, brick, concrete,
metal, glass, marble, stone, etc. Provide a
means to prevent the hearth extension from
shifting and seal gap between the fireplace
frame and hearth extension with a noncom-
bustible material (see Figure 3).
FIREPLACE INSTALLATION
Figure 3 - Hearth Extension
Seal Gap
Fireplace Front
Ember Protector
Fireplace Front
Raised Hearth
Fireplace Front
Elevated
Ember Protector
Ember Protector
Seal Gap
Hearth
Extension
WARNING: Hearth extension
is to be installed only as shown
in Figure 3.
MANTELS
A mantel may be installed if desired (see
Figure 4). Woodwork such as wood trims,
mantels or any other combustible material
projecting from front face must not be placed
within 12" of the fireplace opening. Combus-
tible materials above 12" and projecting more
than 1 1 /
2
" from the fireplace must not be
placed less than 15" from top opening of the
fireplace (NFPA STD 211, Sec. 7-3.3.3).
Mantels or any other combustible material
also may come up to the side edge of the
black metal face of the fireplace just as long
as the projection from the front face fall within
the limit shown in Figure 4.
12 1 /
4
" Ref.
6"
Ref.
15" Min.
12" Min.
1 1 /
2
" Max.
3" Nom.
33°
Combustible
Material
Safe
Zone for
Projection of
Combustible
Materials
Fireplace Opening
Upper
Section of
Fireplace
Figure 4 - Mantel Clearances to
Combustible Material
FIREBOX
SAFE ZONE
Top View of Fireplace
2" Max.
3.0"
Min. to
Perpendicular
Side Wall
12"
8.0"
33°
Combustible
Material Must
Not Overlap
Front Face