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81D0107 15
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
10" or less
12" min. 28"
2
1
/2"
8"
6"
7"
14
1
/2"
4"
Figure 10 - Minimum Mantel Clearance with Hood - NB24
(Example of Unsafe Installation)
Figure 9 - Minimum Mantel Clearance with No Hood — NB24
Example: The bottom of the mantel may project from the wall a maxi-
mum of 10" at a minimum of 28" above the opening.
CLEARANCES AND HEIGHT REQUIREMENTS
Figure 10 is an example of an unsafe mantel installation.
This mantel projects 4" at 8" above the opening, exceeding the
maximum acceptable distance of 2
1
/2" The mantel also proj-
ects 7" at 14
1
/2" above the opening, exceeding the maximum
acceptable distance of 6".
If your mantel profile is unsafe, you may either:
• Raise the mantel to an acceptable height
OR
• Remove the mantel