Floor Protection Requirements Installation - Napoleon NPS45 Installation And Operating Instructions Manual

16
3.4

FLOOR PROTECTION REQUIREMENTS INSTALLATION

THERMAL PROTECTOR:
EN
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.
L
J
R = Thickness / K-Value
K = Thickness / R-Value
With K values, the lower value is a better insulator. With R values, the higher number is better.
K-Value Example:
R-Value Example:
W415-1472 / 04.21.15
J
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.
I
CONVERTING MATERIAL SPECIFICATIONS TO R OR K VALUES
COMMON K and R VALUES CHART
MATERIAL
Micore 300
Wonderboard (cement board)
Common Brick
Cement Mortar
Ceramic Tile
Marble
Air Space (ventilated)
Sand and Gravel
Drywall (gypsum)
Rockwool or Fiberglass Batts
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" (12.7mm) thickness of this board would have a K-Value of .86, which
meets the requirement of our example stove.
This fi replace calls for thermal protection with an R-Value of 0.59. This same board
above is rated as having an R-Value of 2.33 for a 1" (25.4mm) thickness. Therefore,
1/2" (12.7mm) of the Micore 300 Board would have a R-value of 1.165, which meets
the specifi cations for this fi replace.
MINIMUM FLOOR PROTECTION
FRONT (I) SIDES (J)
6" (152mm) 6" (152mm)
K-VALUE
Per inch
VENT (L)
2" (51mm)
R-VALUE
Per inch
0.43 2.33
1.92 0.52
5.00 0.20
5.00 0.20
12.50 0.08
11.00 0.09
0.70 1.43
1.70 0.59
1.00 1.00
0.30 3.33
99.2C