Napoleon Fireplaces NPI45 - Manuel (Page 16)

W415-0702 / B / 04.04.12
16
99.2B
THERMAL PROTECTOR:
This appliance must be installed on a non-combustible thermal protector that extends to the front, sides
and back of the appliance as per the minimum requirements below.
NOTE: Floor protection is required for spark and ash shielding, and for limiting fl oor
temperatures from the radiant heat of the appliance.
J J
I
L
The thermal protector must have an overall R-Value of 1.0. For multiple layers,
add R-Values for each layer to determine the overall R-Value.
CONVERTING MATERIAL SPECIFICATIONS TO R OR K VALUES
R = Thickness / K-Value
K = Thickness / R-Value
MINIMUM FLOOR PROTECTION
FRONT (I) SIDES (J) VENT (L)
6” 6” 2”
COMMON K and R VALUES CHART
MATERIAL K-VALUE R-VALUE
Per inch Per inch
Micore 300 0.43 2.33
Wonderboard (cement board) 1.92 0.52
Common Brick 5.00 0.20
Cement Mortar 5.00 0.20
Ceramic Tile 12.50 0.08
Marble 11.00 0.09
Air Space (ventilated) 0.70 1.43
Sand and Gravel 1.70 0.59
Drywall (gypsum) 1.00 1.00
Rockwool or Fiberglass Batts 0.30 3.33
With K values, the lower value is a better insulator. With R values, the highest number is better.
K-Value Example:
A wood stove may call for thermal protection which has a K factor of 1 or less. A product
such as Micore 300 Board from USG has a K-Value of approximately .43 per inch.
Therefore, a 1/2” thickness of this board would have a K-Value of .86, which meets the
requirement of our example stove.
R-Value Example:
A stove or fi replace may call for thermal protection with an R-Value of 1.5. This same
board above is rated as having an R-Value of 2.33 for a 1” thickness. Therefore, 3/4” of
the Micore 300 Board would meet the specifi cations for this stove.
3.4 FLOOR PROTECTION REQUIREMENTS INSTALLATION