Heatiator C40 owner manual Finishing, C. Hearth Extension, A. Non-CombustibleMaterials

10 Finishing	C. Hearth Extension
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 fibers	-	Plastic

•Any material that can ignite and burn; flame proofed or not, plastered or un-plastered

WARNING! Risk of fire! High temperatures, sparks, embers or other burning material falling from the fireplace may ignite flooring or concealed combustible surfaces.

•Protective metal hearth strips MUST be installed.

•Hearth extensions MUST be installed exactly as specified.

•You MUST use a hearth extension with this fireplace.

•Refer to Figure 10.1 for minimum dimensions.

•This fireplace 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.

Table 10.1

R = 1/k x inches of thickness

Table 10.2

Hearth Extension Insulation Alternatives

Minimum R Value = 2.18

			Minimum
Material	k per inch	R per inch	thickness
	thick	thick	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.
			16-5/8 in. - 23-
Marble	14.3-20.0	0.07-0.05	3/8 in.

8 in. (203mm)

from each side of fuel loading door

BA

Model #		A	B
Constitution
	in.	41	20
	mm	1041	508

Figure 10.1 Hearth Extension Dimension

Page 54 Heatilator • Constitution EPA Fireplace • 480-1091D 4/20/11