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Heatilator • Constitution EPA Fireplace • 480-1091D
4/20/11
10
Finishing
• Materials which will not ignite and burn, composed of
any combination of the following:
- Steel - Iron
- Brick - Tile
- Concrete - Slate
- Glass - Plasters
• Materials reported as passing ASTM E 136, Standard
Test Method for Behavior of Metals, in a Vertical Tube
Furnace at 750° C
• Materials made of or surfaced with any of the following
materials:
- Wood - Compressed paper
- Plant bers - Plastic
• Any material that can ignite and burn; ame proofed or
not, plastered or un-plastered
Table 10.1
R = 1/k x inches of thickness
Table 10.2
WARNING!
• You MUST use a hearth extension with this replace.
• Refer to Figure 10.1 for minimum dimensions.
• This replace has been tested and approved for use with
a hearth extension insulated to a minimum R value of
2.18.
• 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 10.1
to convert a k value to an R value,
• Refer to Table 10.2 for hearth extension insulation
alternatives.
B
8 in. (203mm)
from each side of
fuel loading door
A
Model #
Constitution
A B
41 20
mm
1041 508
Hearth Extension Insulation Alternatives
Minimum R Value = 2.18
Material
k per inch
thick
R per inch
thick
Minimum
thickness
required
Hearth & Home HX3,
HX4 0.49 2.18 1 in.
USG Micore 300™ 0.49 2.18 1 in.
USG Durock™ Cement
Board 1.92 0.52 2-1/4 in.
Cement Mortor 5.0 0.20 5-7/8 in.
Common Brick 5.0 0.20 5-7/8 in.
Ceramic Tile 12.50 0.08 14-5/8 in.
Armstrong™ Privacy
Guard Plus 0.46 2.18 1/2 in.
Marble 14.3-20.0 0.07-0.05
16-5/8 in. - 23-
3/8 in.
Figure 10.1 Hearth Extension Dimension
A. Non-Combustible Materials
B. Combustible Materials
C. Hearth Extension