Hearth and Home Technologies EL36 Series - Manual (Page 38)

38
11 11
Finishing
A. Non-Combustible Materials
• 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
B. Combustible Materials
• Materials made of or surfaced with any of the following
materials:
- Wood
- Compressed paper
- Plant fi bers - Plastic
• Any material that can ignite and burn; fl ame proofed or
not, plastered or un-plastered
C. Hearth Extension
WARNING! Risk of fi re! High temperatures, sparks,
embers or other burning material falling from the fi replace
may ignite fl ooring or concealed combustible surfaces.
• Protective metal hearth strips MUST be installed.
• Hearth extensions MUST be installed exactly as
specifi ed.
Table 11.1
Hearth Extension Insulation Alternatives-Total minimum R Value must equal 1.03
Material
k per inch
thick
r per inch
thick
Minimum
thickness
required
Hearth & Home HX3, HX4 (Micore 300™) 0.49 2.06 1/2 in.
USG Micore 160™ 0.39 2.54 1/2 in.
USG Durock™ Cement Board 1.92 0.52 2 in.
Cement Mortor 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.
R = 1/k x inches of thickness
• You MUST use a hearth extension with this fi replace.
• Refer to Figure 11.1 for minimum dimensions.
• This
fi 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 11.1
to convert a k value to an R value,
• Refer to Table 11.2 for hearth extension insulation
alternatives.
Table 11.2
Heatilator • EL36/EL42 • 4044-132 • Rev V • 11/08