Monessen Hearth NB18 Installation And Operating Instructions Manual page 8

NB18/NB24 Gas Log Set
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 resis-
tant 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"
12" and observe profiles shown in
8
Requirements for Safe Installation with Wooden Mantel, Shelf or
other Combustible Projection
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
Extend heat resistant to at least 8",
install hood and observe profiles
shown in Figure 7; OR
extend heat resistant material to at
Figure 6
CLEARANCES and HEIGHT REQUIREMENTS
Figure 5 -
Measuring Heat Resistant Material for Mantel
NB24
Hood not required. Observe profile (side
elevations shown on 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
hood and observe profiles shown in
Figure 7; OR extend heat resistant material to at
least 12" and observe profiles shown in
Figure 8
8" or More
of Heat
Hood
Resistant
Material
Heater in Fireplace
or Firebox
FP2255
FP2255
measure heat resist
81D0107