Lenoxx Electronics CI2000HT - Manual (Page 6)

PLANNING YOUR INSTALLATION – Model CI1000HT
PAGE 6
Top View
FOR INSTALLATIONS IN CANADA
MODEL CI1000HT
FLOOR PROTECTION
The floor protector must meet or exceed the minimum ther-
mal requirements as defined on this page (see Floor Pro-
tection Using Alternate Material As Floor Protector). If the
floor protection is to be stone, tile, brick, etc., it must be
mortared or grouted to form a continuous noncombustible
surface. If a chimney connector extends horizontally over
the floor, protection
must also cover the
floor under connector
and at least 2" (51
mm) to either side.
The floor protector must
fully cover the area
beneath the appliance
and extend 18” to the
front, 8” to the sides,
and 8” from the back as
shown in the illustration
to the right.
FLOOR PROTECTION USING ALTERNATE MATERIAL
AS FLOOR PROTECTOR
The hearth pad or alternate material used as a floor pro-
tector must be constructed of a durable noncombustible
material having an equal or better thermal conductivity
value (lower k value) of k = .84 BTU / IN FT 2 HR °F or a
thermal resistance that equals or exceeds r = 1.19 HR °F
FT 2 IN/BTU with a minimum thickness of 1.45”. With these
values, determine the minimum thickness of the alternate
material required using the formula(s) and the table
shown here (see chart – Approved Alternative Materials
for Floor Protection).
Note: Any noncombustible material having a thickness of
1.45" (37 mm) whose k value is less than .84 or whose r
value is more than 1.19 is acceptable. If the alternate ma-
terial used has a higher k value or lower r value will re-
quire a greater thickness of the material used. In some
cases, if the k value is less or the r value higher, a thinner
material may be used.
Methods of determining floor protection equivalents:
To determine the thickness required for the alternate ma-
terial when either the k value or r value is known, use ei-
ther the k formula or r formula:
Example: Durock  Cement Board is to be used for the
floor protection. How thick must this material be? The fol-
lowing formulas give the means of determining minimum
thickness required.
T
M
= minimum thickness required for alternate material
k
M
= k value per inch of alternate material
T
L
= minimum thickness of listed material
r
M
= r value per inch of alternate material
Using the k formula:
Desired thickness k value of desire Minimum
of the alternate = material (per inch) x thickness
material k value of listed of listed
material (per inch) material
T
M
(inches) = k
M
x T
L
.84
T
M
(inches) = 1.92 x .1.45”
.84
Answer using k: ~2.287 x ~1.45” = ~ 3.316” = ~ 3 5/16”
~ 3 5/16” thickness Durock Cement Board will be required.
Using the r formula:
T
M
(inches) = 1.19 x T
L
r
M
T
M
(inches) = 1.19 x .1.45”
.52
Answer using r: ~2.287 x 1.45” = ~3.316 =~ 3 5/16”
~ 3 5/16” thickness Durock Cement Board will be required.
At times it is important to know what combination of materials are
acceptable for use as floor protection. The “R values” are used to
determine acceptable combinations of materials because “R val-
ues” are additive where r and k values are not.
“R value” = 1 = r x thickness of material used
k
Example: “R value” = 1/k = r x thickness of material used. Given that
the required “R value” for a suitable floor protector used must be equal to
or greater than:“R” = r x T
L
= 1.19 x 1.45” = ~ 1.73.
Listed Material
Listed Material Thermal Values Listed Min.
Thickness
k (per inch) r (per inch) T
L
Listed Material → .84 1.19 1.45”
Approved Alternate Materials for
Floor/Hearth Protection (**)
Alternative
Materials
↓
Thermal Values * Minimum
Thickness
k (per inch) r (per inch) T
M
Kaowool M Board .47 2.13 * 1.45”
Micore 160  .35 2.86 * 1.45”
Micore 300  .46 2.18 * 1.45”
Durock  Cement Board 1.92 .52 3.5/16”
Hardibacker  1.95 .51 3 3/8”
Hardibacker 500  2.30 .44 4”
Cultered Stone
Hearthstone

2.82 .35 4 7/8”
Wonderboard 3.23 0.31 5 9/16”
Face brick 9.00 0.11 15 9/16”
Common brick 5.00 0.20 8 5/8”
Cement mortar 5.00 0.20 8 5/8”
Ceramic tile 12.5 .08 21 9/16”
Marble ~ 20.0 ~ .05 34 9/16”
Note: To convert inches to millimeters divide by .03937.
(*) After minimum thickness is calculated, the thickness can be
no less than 1.45” (36.8mm).
(**) If the floor protector to be used is a noncombustible mate-
rial and is NOT listed on this chart on this chart, the manufac-
turer of the material must provide either the listed k-value per
inch or r-value per inch and the minimum thickness will need to
be calculated per instructions on this page.
8" (203 mm)
8"
(203 mm)
18" (457 mm)
8"
(203 mm)