R
Page 12
November 5, 2010
Cumberland Gap Wood Stove
7006-188G
B. Calculating Alternate Floor Protection Material
Thermal Conductivity: k value
The k value indicates the amount of heat (in BTU’s) that will fl ow
in 1 hour through 1 square foot of a uniform material 1 inch thick
for each degree (F) of temperature difference from one side of
the material to the other. The LOWER the k factor means less
heat is being conducted through the non-combustible material
to the combustible material beneath it. The k value of a mate-
rial must be equal or smaller then the required k value to be
acceptable.
(BTU) (inch)
(foot
2
(hour) (
o
F)
Thermal Resistance: R value
The R value is a measure of a material’s resisteance to heat
transfer. R value is convenient when more than one material
is used since you can add the R values together, whereas you
can not do this for k value. The HIGHER the R factor means
less heat is being conducted through the non-combustible ma-
terial to the combustible material beneath it. The R value of a
material must be equal or larger then the required R value to be
acceptable.
Converting k to R:
Divide 1 by k and multiply the results times the thickness in inch-
es of the material.
R = 1/k x inches of thickness
Converting R to k:
Divide the inches of thickness by R.
k = inches of thickness/R
Calculatons:
Example: Floor protection requires k value of 0.84 and 3/4 inch
thick.
Alternative material has a k value of 0.6 and is 3/4 inch thick.
Divide 0.6 by .75 = k value of 0.80. This k value is smaller than
0.84 and therefore is acceptable.
30-3/8"
52"
required coverage
16"
38-5/8”
optional
coverage
34-5/8"
8"
Front fuel
loading door
52"
optional coverage
optional
coverage
8"
optional
coverage
44-3/4"
optional coverage
optional
coverage
18-5/8"
48-7/16"
53-7/16"
16"
16"
required coverage
25-3/4"
11-1/8"
8"
38-5/8"
Fuel loading
door
Floor protection must extend
length of flue and 2 inches
(51mm) beyond each side of
pipe (shaded area)
HORIZONTAL VENTING
SIDE FUEL DOOR LOCKED SHUT - USA ONLY
BOTH FUEL DOORS ACCESSIBLE - USA ONLY
USA - Required
CANADA - Recommended
NOTE:
• Illustrations and photos refl ect typical
installations and are FOR DESIGN
PURPOSES ONLY.
• Illustrations/diagrams are not drawn to
scale.
• Actual installation may vary due to
individual design preference
• Hearth & Home Technologies reserves
the right to alter its products.
A. Hearth Protection Requirements (Cont'd)
Figure 12.1
Figure 12.2
