18
In the case of a known K and thickness of alternative materials to be used in combination,
convert all K values to R by dividing the thickness of each material by its K value. Add the R
values of your proposed materials as shown in the previous example.
Example:
K value = 0.75
Thickness = 1
R value = Thickness/K = 1/0.75 = 1.33
2.4.2.2 How to eliminate the need of a R value
It is however possible to eliminate the R value by elevating the unit from 4'' above the floor
(see Figure 9), but the joint between the extension of the hearth and the fireplace must be
protected by a non-combustible material. For example, a sheet metal (not included) as
illustrated in Figure 9 (B). Please note that a combustible floor protection of at least 18” long
must be installed in front of the fireplace as illustrated in Figure 9 (A).
Figure 9
Содержание FP10 Lafayette
Страница 21: ...20 Figure 10 Figure 11...
Страница 22: ...21 Figure 12 Figure 13...
Страница 23: ...22 Figure 14...
Страница 25: ...24 Figure 16...
Страница 27: ...26 Figure 18...
Страница 39: ...38 Figure 36a Figure 36b...
Страница 44: ...43 Figure 40 Figure 41...
