Superior WRE3036WH Installation And Operation Instructions Manual page 6

HEARTH EXTENSION
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
to protect combustible floor construction in front of the fireplace.
Fabricate a hearth extension using a material which meets the fol-
lowing 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 the
manufacturer or supplier of the noncombustible material. If the
hearth extension 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
noncombustible material (see Figure 3).
WARNING: Hearth extension is to be installed only
as shown in Figure 3.
Fireplace Front
Ember Protector
Fireplace Front
Raised Hearth
Ember Protector
Fireplace Front
Elevated
Ember Protector
Figure 3 - Hearth Extension
MANTELS
A mantel may be installed if desired (see Figure 4). Woodwork such
as wood trims, mantels or any other combustible material project-
ing from the front face must not be placed within 12" of the fireplace
opening. Combustible materials above 12" and projecting more than
1 / " from the fireplace must not be placed less than 15" from the top
1
2
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.
6
FIREPLACE INSTALLATION Continued
Seal Gap
Hearth
Extension
Seal Gap
Superiorfireplaces.US.com
Top View of Fireplace
8.0"
33°
SAFE ZONE
Min. to
Perpendicular
Side Wall
12"
12 / " Ref.
1
4
6"
Ref.
33°
3" Nom.
1 / " Max.
1
12" Min.
2
9" Min.
Fireplace Opening
Figure 4 - Mantel Clearances to Combustible Material
FIREBOX
2" Max.
3.0"
Combustible
Material Must
Not Overlap
Front Face
Combustible
Material
Safe
Zone for
Projection of
Combustible
Materials
Upper
Section of
Fireplace
127020-01C