9
81D3032
NBST27 Unvented Gas Log Set
CLEARANCE 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 resis-
tant material shown in
Figure 6,
then refer to Table B.
FP2365
heat resist w/hood
8” or
More
of Heat
Resistant
Material
Hood
Heater in Fire-
place or Firebox
FP2365
Figure 6 -
Measure Heat Resistant
Material for Mantel
Heat Resistant
Requirements for Safe Installation
Material
with Wooden Mantel, Shelf or
Measurement
other Combustible Projection
12” or more
Hood not required. Observe profile (side
elevations) shown in
Figure 7
.
8” to less than 12” Install hood and observer profiles shown
in
Figure 8
;
OR
extend heat resistant
material to at least 12” and observe
profiles shown in
Figure 7
.
Less than 8”
Extend heat resistant material to at least
8”, install hood and observe profiles
shown in
Figure 8
;
OR
extend heat
resistant material to at least 12” and
observe profiles shown in
Figure 7
.
Table B -
Heat Resistant Material Heights and Mantel Location
FP2366
mantel clear no hood
12”
Min.
28”
10” or Less
Heat Resistant
Material
Heater in
Fireplace
or Firebox
FP2366
Example:
The bottom of the mantel
may project from the wall a
maximum of 10” at a mini-
mum of 28” above the fire-
box.
Figure 7 -
Minimum Mantel Clearance
with No Hood
2
56O
”
12”
13”
24”
FP2367
mantel clearance with hood
Heat Resistant
Material
Heater in
Fireplace
or Firebox
Hood
FP2367
Example:
A mantel may project from the wall a maximum of 2
Z\x
” at a
minimum of 13” above the opening, and a maximum of 12”
at a minimum of 24” above the opening.
Figure 8 -
Minimum Mantel
Clearance with Hood