Monessen Hearth NBST27NV-B Installation & Owner's Manual page 10

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 3.3, then refer to Table B.
Figure 3.3 - Measure Heat Resistant Material for Mantel
FP2365
heat resist w/hood
Table B - Heat Resistant Material Heights and Mantel Loca-
tion
Heat Resistant
Material Mea-
surement Requirements for Safe Installation
12" or more Hood not required. Observe profile
(side elevations) shown in Figure 6.
8" to less than 12" Install hood and observer profiles
shown in Figure 7; OR extend heat
resistant material to at least 12" and
observe profiles shown in Figure 6.
Less than 8" Extend heat resistant material to at
least 8", install hood and observe pro-
files shown in Figure 7; OR extend heat
resistant material to at least 12" and
observe profiles shown in Figure 6.
10 Monessen • NBST27-B Gas Log Set Owner's /Installation Manual • 4615-900 Rev. D • 01/2020
8" or More of
Hood
Heat Resistant
Material
Heater in Fireplace or Firebox
Heat Resistant
Material
Example:
The bottom of the mantel may project from the wall a maxi-
mum of 10" at a minimum of 28" above the firebox.
Figure 3.4 - Minimum Mantel Clearance with No Hood
FP2366
mantel clear no hood
Heat Resistant
Material
Example:
A mantel may project from the wall a maximum of 2
FP2367
minimum of 13" above the opening, and a maximum of 12" at
mantel clearance with hood
a minimum of 24" above the opening.
Figure 3.5 - Minimum Mantel Clearance with Hood
10" or Less
28"
12"
Min.
Heater in
Fireplace
or Firebox
12"
24"
2 1/2"
13"
Hood
Heater in Fireplace or
Firebox
⁄ " at a
1
2