Monessen Hearth NB24 Installation And Operating Instructions Manual page 8

CLEARANCES AND HEIGHT REQUIREMENTS
Heat resistant material (minimum requirements) with
wooden mantel or other combustible projection:
To install the heater with a wooden mantel, shelf or other
combustible projection above, first measure the heat
resistant material shown in Figure 5, then refer to Table B.
Table B - Heat Resistant Material Requirements Height and Mantel Location
Heat Resistant
Material
Measurement
12" or more
8" or less than 12"
Less than 8"
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev E • 04/18
8
Requirements for Safe Installation with Wooden Mantel, Shelf or other Combustible
NB18
Hood not required. Observe profiles (side
elevations) shown in Figure 6.
Install hood and observe profiles shown in
Figure 7. OR Extend heat resistant material
to at least 12" and observe profiles and
observe profiles shown in Figure 8.
Extend heat resistant to at least 8", install
hood and observe profiles shown in Figure
7. OR Extend heat resistant material to at
least 12" and observe profiles shown in
Figure 6.
Figure 5 -
Measuring Heat Resistant Material for Mantel
FP2255
measure heat resist
Projection
NB24
Hood not required. Observe profile (side
elevations shown in Figure 8.
Install hood and observe profiles shown in
Figure 7. OR Extend heat resistant material
to at least 12" and observe profiles shown in
Figure 8.
Extend heat resistant material to least 8",
install install hood and observe profiles
shown in Figure 7. OR Extend heat resistant
material to at least 12" and observe profiles
shown in Figure 6.
NB18/NB24 Gas Log Set
8" or More
of Heat
Hood
Resistant
Material
Heater in Fireplace
or Firebox
FP2255