Heatilator Constitution C40-C Installation Manual page 39

D. Finishing the Hearth Extension
WARNING! Risk of Fire!
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a hearth extension insulated to a minimum R value of
1.03.
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alternatives.
Table 8.1
R = 1/k x inches of thickness
Table 8.2
Hearth Extension Insulation Alternatives, R Value = 1.03
Material
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USG Micore 300™
USG Durock™ Cement Board
Cement Mortar
Common Brick
&HUDPLF 7LOH
Armstrong™ Privacy Guard Plus
0DUEOH
WARNING! Risk of Fire!
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Heatilator • C40-C Constitution Installation Manual • 4186-901 • Rev H • 03/23
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Minimum
k per inch r per inch thickness
thick thick required
  1/2 in.
  1/2 in.
   2 in.
 0.20   LQ
 0.20   LQ
    LQ
  1 in.
14.3-20.0 0.07-0.05 14 5/8 in. - 20 3/8 in.
B
Model # C40-C
LQ
mm
Figure 8.6 Minimum Hearth Extension Dimensions
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Fascia
Outer Shell
Tile,marble or other
Flange
non-combustible finish material
Non-combustible
Minimum 20 in. (508mm) in front and
material supplied
8 in. (203mm) on sides to fuel opening
with unit.
Protective metal
Non-combustible sealant or grout
hearth strip
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum 2 in. (51mm) Cement Board or
equivalent, (or one piece HX4)
Figure 8.7 Fireplace and Hearth Extension Flush on the Floor.
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8 in. (203mm) minimum
from each side of
fuel opening
A
A B
 20
 
Tile,marble or other
non-combustible
finish material
Combustible Floor