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81D0107 13
Heater in
Fireplace or
Firebox
8" or More of
Heat Resista
n
Material
Hood
CLEARANCES and HEIGHT REQUIREMENTS
Figure 6 - Measuring Heat Resistant Material for Mantel
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 mate-
rial shown in Figure 6, then refer to Table B.
TABLE B - Heat Resistant Material Heights and Mantel Location
HEAT RESISTANT
MATERIAL
MEASUREMENT
REQUIREMENTS FOR SAFE INSTALLATION WITH WOODEN MANTEL,
SHELF OR OTHER COMBUSTIBLE PROJECTION
NB18 NB24
12" or more Hood not required. Observe profi les (side
elevations) shown in Figure 7, page 14.
Hood not required. Observe profi le (side
elevations) shown in Figure 9, page 15
8" to less than 12" Install hood and observe profi les showin in
Figure 8, page 14, OR extend heat resis-
tant material to at least 12” and observe
profi les shown in Figure 7, page 14.
Install hood and observe profi les shown in
Figure 8, page 14; OR extend heat resistant
material to at least 12" and observe profi les
shown in Figure 9, page 15.
Less than 8" Extend heat resistant material to at least
8", install hood and observe profi les shown
in Figure 8, page 14; OR extend heat resis-
tant material to at least 12" and observe
profi les shown in Figure 7, page 14.
Extend heat resistant material to at least 8",
install hood and observe profi les shown in
Figure 8, page 14, OR extend heat resistant
material to at least 12" and observe profi les
shown in Figure 9, page 15.