Installation Manuel

Majestic Sovereign Series • SA36/SA42C • Installers Manual • 4010-262 • Rev E • 07/19/16
28
B. Hearth Extension, Building and Fin-
ishing
Table 7.1
R = 1/k x inches of thickness
Table 7.2
WARNING! Risk of Fire! High temperatures, sparks,
embersorotherburningmaterialfallingfromthere-
place may ignite ooring or concealed combustible
surfaces.
• Protective metal hearth strips MUST be installed.
• Hearth extensions MUST be installed exactly as
specied.
A hearth extension must be installed with all re-
places to protect the combustible oor in front of the
replace from both radiant heat and sparks.
• You MUST use a hearth extension with this
replace.
• Refer to Figure 7.3 for minimum dimensions.
• This replace has been tested and approved for use
with a hearth extension insulated to a minimum R
value of 1.03.
• The hearth extension material MUST be covered
with tile, stone or other non-combustible material.
• Manufactured hearth materials will usually have a
published R value (resistance to heat) or k value
(conductivity of heat). Refer to the formula in Table
7.1 to convert a k value to an R value,
• Refer to Table 7.2 for hearth extension insulation
alternatives.
WARNING! Risk of Fire!
Hearth extensions are to be installed only as illustrated to prevent
high temperatures from occurring on concealed combustible
materials.
WARNING! Risk of Fire!
• Maintain clearances.
• Use only non-combustible material below standoffs, material
such as cement board is acceptable.
• Framingornishingmaterialusedonthefrontofthereplace
closer than the minimums listed, must be constructed entirely
of non-combustible materials (i.e., steel studs, concrete board,
etc.).
WARNING! Risk of Fire!
Hearth & Home Technologies is not responsible for
discoloration, cracking or other material failures of
nishingmaterialsduetoheatexposureorsmoke.
 • Choosenishingmaterialscarefully.
Figure 7.3 Hearth Extension Dimensions
C
B
A
C
Hearth Extension Dimensions
Model # A B C
SA36
(HX3)
in. 52 16 8
mm 1321 406 203
SA42
(HX4)
in. 66 20 12
mm 1676 508 305
Hearth Extension Insulation Alternatives, R Value = 1.03
Material
k per inch
thick
r per inch
thick
Minimum
thickness
required
Hearth & Home HX3, HX4 0.49 2.06 1/2 in.
USG Micore 300™ 0.49 2.06 1/2 in.
USG Durock™ Cement Board 1.92 0.52 2 in.
Cement Mortar 5.0 0.20 5 1/8 in.
Common Brick 5.0 0.20 5 1/8 in.
Ceramic Tile 12.50 0.08 12 1/4 in.
Armstrong™ Privacy Guard Plus 0.46 2.18 1/2 in.
Marble 14.3-20.0 0.07-0.05 14 5/8 in. - 20 3/8 in.