9
138344_Rev_D - C450 Kennebec 8.2.10
Hearth Protection Requirements
The floor area in front of fireplace insert must be
protected from live sparks and radiant heat.
• Materials: Hearth protection must be noncom-
bustible insulating board, having an R value of
2.92 (0.343 K-value) such as Kaowool® 2600 #15
or the equivalent mortared masonry material.
See Appendix A on page 18 for information how
to calculate the R-value of alternative materials.
Alternate protection must composed of materials
as specified by NFPA 211.
• Protected Area: 18” Deep x 40” Wide
A) Front - The protection must extend at least 18
inches (457 mm) forward from the door opening.
B) Sides - Protection must extend 20 inches
(508 mm) to both sides of the centerline of the
insert.
• Note that the firebox may extend out forward of
the fireplace face depending on where the cabinet
sleeve has been set to accommodate flue connec-
tion. Always measure hearth protection from the
final, installed position of the firebox and the door
opening. See figures 9 and 10.
Figure 9. Sleeve adjustment results in minimum firebox
extension forward of fireplace face.
Firebox
Sleeve
Firebox
Sleeve
Figure 10. Provide hearth protection to accommodate
maximum firebox extension forward of fireplace face.
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