The sum of all “R values” is: .70 + .10 +. 038
+ .10 = .938
This would NOT be an acceptable combination of material for the hearth extension since the total calculated “R value” of the materials used is under the required “R value” of 1.19. An additional layer of insulating materials must be used.
Note: Also see NFI Certification Manuals for expanded explanation on calculating “R val- ues” when multiple materials are used.
WARNING: THE CRACK BETWEEN THE FIREPLACE AND THE HEARTH EXTENSION MUST BE SEALED WITH A NON- COMBUSTIBLE MATERIAL.
WARNING: WHEN INSTALLING HEARTH EXTENSION IN FRONT, THE FIREPLACE MUST BE RAISED IF HEIGHT OF HEARTH EXTENSION EXCEEDS 7" (178 MM) ABOVE THE BOTTOM OF THE FIREPLACE (SEE FIGURE 49 ).
7" Max.
(178mm)
Max. Thickness of Hearth Extension when Fireplace is on the Floor
Figure 49
Secure the hearth extension to the floor to prevent possible shifting.
18
There are a wide variety of “finished looks” for these fireplaces, from formal wall decor with elaborate mantels to rustic wood paneling or warm brick facings.
Only noncombustible materials like stone, tile, brick, etc., may overlap the black front facing. Do not extend these materials beyond the black facing and into the firebox area. Be sure not to interfere with the installation and operation of glass doors or block the upper or lower grilles. Seal all joints between the black facing and wall surrounds to prevent air intrusion. Use non- combustible caulking material only to seal the black metal facing to the surround material on the finished wall.
Combustible materials may project beyond the sides of the fireplace opening as long as they are kept within the shaded areas illustrated in Figure 50.
Combustible
Materials AllowedFireplace
in Shaded Areas
3¹⁄₄"
(83mm)
| ¹⁄₂" |
4 ³⁄₄" | (13mm) |
15° | |
(121mm) |
|
12" (305mm) Min. Distance to Protected Side Wall
18" (457mm)
Min. Distance to
Unprotected Side Wall
Figure 50
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
The following items are available for use in the installation of this appliance. Separate installation instructions are packaged with all combustion air kits and chimney terminations.
If you encounter any problems or have questions concerning the installation or application of this system, please contact your distributor. For the name of your nearest distributor call:
LENNOX HEARTH PRODUCTS
1110 West Taft Avenue
Orange, California 92865
Stabilizer | 63L26 |
Offset/ Return |
|
|
Package (30° ) | 63L23 |
Locking Band63L60FLB
Model | Part Number | Weight |
19M22 | 450 lbs. | |
30M31 | 450 lbs. |