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SB50HB Series Woodburning Fireplace
The ability of insulating material to retard the transfer of
heat may be expressed as either Thermal Conductance (C),
Thermal Conductivity (K), or Thermal Resistance (R). The
mathematical relationship of these values and the formulas
for converting one value to another is as follows:
C=K divided by the material thickness
(Example C = .43 divided by 1/2 (.50)
C = .86)
K = C multiplies by the material thickness
(Example K = .86 multiplied by 1/2 (.50)
K = .43)
R= The material thickness divided by K
(Example R = 1/2 (.50) divided by .43
R = 1.16)
WarNINg: The hearth extension and the
metal safety strip should be installed only
in a horizontal relationship to the fireplace.
Figure 14
12"
Min.
Top of Raised Hearth
With either type hearth extension minor shifting of the sup-
porting floor or expansion and contraction may eventually
cause a crack to develop between the hearth extension and
the face of the fireplace. To help prevent the crack from
developing, the hearth extension materials must be firmly
fastened in place. Wall ties should be screwed to the face
of the fireplace and imbedded in the mortar joints of brick,
stone, or other non-combustible materials. The metal safety
12
Figure 13
FP2223
28 "
12"
Min.
Hearth
Floor Line with
Extensions
Raised Hearth
strip packed with the fireplace must be placed beneath
the fireplace and extended under the hearth extension
or into a mortar joint of the hearth extension as shown by
FP2224
Figures 10, 13, and 14. In the event a crack does eventu-
hearth ext front
ally develop, the metal safety strip will serve as a barrier
to prevent sparks or embers from falling from the fireplace
onto combustible flooring materials.
59"
Hearth
Protection
20"
FP2223
hearth protection
20" Min.
FP2224
Metal Safety
Strip
FLOOr prOTeCTION
58"
30"
Metal Safety Strip
Combustible
Floor
74"
87D0058
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