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Version 2.0b 27
FLOOR PROTECTION REQUIREMENTS
1. All Country Flame freestanding Harvester stoves require a listed floor protector that is
noncombustible. Country Flame Harvester stoves were tested with a listed floor protection that
had an R-value equal to or greater than 1.5. Ensure that any floor protection equals or exceeds
R = 1.5 or greater. Refer to FIGURE 10 for floor protector clearance requirements.
2. If a floor protector, different from the tested floor protector, is to be used, it must meet or
exceed the requirements of the listed R-value of the tested floor protector. To convert alternate
floor protectors to their respective R value use the following procedures:
a. Convert floor material specification to R-value.
i. R-value is given – no conversion is required.
ii. k-factor is given with required thickness (T) in inches: R = (1/k) x T.
iii. C-factor given: R = 1/C.
b. Determine the R-value of the proposed alternate floor protector.
i. Use the formulas provided in STEP 2a to convert values not expressed as “R.”
ii. For multiple layers of material, add each R-value of each layer to determine the
materials overall R-Value.
c. If the overall R-value of the alternate material is greater than the R-value tested
material defined in STEP 1, then the alternate floor protection is acceptable.
d. EXAMPLE:
i. The tested material was ¾-inch thick with a k-factor of 0.84.
ii. The R-value of the tested material was R = (1/0.84) x 3/4 = 0.893.
iii. The proposed alternative floor protector is 4-inch brick material with a C-factor
of 1.25 over 1/8-inch mineral board with k-factor of .29.
iv. The 4-inch brick material has a value of R
brick
= (1/1.25) = 0.80.
v. The mineral board has a value of R
mnbrd
= 1/0.29 x 0.125 = 0.431
vi. Total R
brick
+ R
mnbrd
= 0.80 + 0.431 = 1.231.
vii. Since the total R-value of the alternate example floor protector (R=1.231) is
greater than the tested example floor protector (R=0.893), the alternate is
acceptable.
3. Listed Floor Protector Definitions:
a. Thermal Conductance = C = Btu/(hr)(ft
2
)(
O
F) = W/(m
2
)(
O
K)
b. Thermal Conductivity = k = (Btu)(inch)/(hr)(ft
2
)(
O
F) = W/(m)(
O
K) = Btu/(hr)(ft)(
O
F)
c. Thermal Resistance = R = (ft
2
)(hr)(
O
F)/Btu = (m
2
)(
O
K)/W
4. Install in accordance with 24 CFR, Part 3280 (HUD).
5. WARNING: Harvester stoves must always be placed on a listed floor protector if the existing
floor where the stove is to be placed is made of any combustible material. IF THE AREA
WHERE THE STOVE IS TO BE PLACED IS CARPETED, THE CARPET MUST BE
REMOVED. A LISTED FLOOR PROTECTOR IS NEVER TO BE PLACED ON CARPET.
CHECK LOCAL CODES FOR ADDITIONAL CARPET RESTRICTIONS AND FLOOR
PROTECTION REQUIREMENTS.