USSC 5660 Installation And Operating Manual page 27

INSERT PELLET STOVE INSTALLATION ‐ continued
Minimum Clearance to Combustibles and Floor Protection
A: Side wall: 16" to side of appliance
B: Top Trim: 5" above top of appliance
C: Side trim: 10.5" to side of appliance
D: Mantle: 10" above top of appliance
Floor Protection
When in MASONRY fireplaces, use ½ inch thick non‐combustible material.
When in Factory‐built fireplaces, use a 1 inch, non‐combustible surface with a k factor of 0.84. For multiple layers,
add R‐values of each layer to determine the overall R‐value. The R value for the required board is 1.2.
Convert specification to R‐value:
k‐factor is given with a required thickness (T) in inches: R=1/k x T. The C‐factor is given: R=1/C
Example:
If the floor protector is 4" brick with a C‐factor of 1.25 over 1/8" mineral board with a "k" factor of 0.29 the total R‐
value of the system is:
4" brick C=1.25, R=1/1.25=0.8
1/8" mineral board K=0.29, R=1/0.29 x 0.125=0.431
Total R = Rbrick + Rmineral = 0.8 + 0.431 = 1.231
Total R is greater than 1.2, the system is acceptable.
6
Figure 20
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