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HEARTH EXTENSIONS
A hearth extension must be installed with all fire-
places. It is to protect the combustible floor in front of
the fireplace from both radiant heat and sparks.
The construction of and materials used for a factory-
built hearth extension are shown in Figure 5. A
Field constructed Hearth Extensions should be constructed in accordance with the minimum dimensions provid-
ed in Figure 6.
HEARTH EXTENSIONS ARE TO BE INSTALLED ONLY AS ILLUSTRATED TO PRE-
VENT HIGH TEMPERATURES FROM OCCURRING ON CONCEALED COMBUSTIBLE
MATERIALS. HEARTH SEALING STRIPS PREVENT BURNING OR HOT PARTICLES
FROM INADVERTENTLY FALLING DIRECTLY ON COMBUSTIBLE SURFACES IN THE
4-99
Factory-Built Hearth Extension
(THERMAL CONDUCTIVITY) "K" = BTU in./hr. ft
TO SUBSTITUTE ALTERNATE INSULATION MATERIAL, YOU NEED TO KNOW THE "K"
FACTOR FOR THAT MATERIAL. TO CALCULATE THE REQUIRED THICKNESS FOR THE
ALTERNATE MATERIAL USE THE FOLLOWING FORMULA:
K ALT.
.43
EVENT THE BUILDING SHOULD SETTLE AND DISTURB THE ORIGINAL
EM SERIES WOODBURNING FIREPLACE
hearth extension of this construction may be covered
with any non-combustible decorative material and
may have a maximum thickness of 6". Seal gaps
between the hearth extension and the front of the fire-
place with a non-combustible sealant.
Figure 5
x .5 = THICKNESS OF ALTERNATE MAT. (INCHES)
CAT. #
A
EM-415R
52"
EM-485R
66"
Figure 6 - Hearth Extension
WARNING!
CONSTRUCTION.
10
EXAMPLES OF INSULATION
REQUIRED
THICKNESS
USG MICORE CV230
1/2"
2
°F
EXAMPLE:"K" OF BRICK = 5
5
x .5 = 5.81 IN. OF BRICK.
.43
B
16"
20"
K VALUE
0.43
31316A
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